Solve the system of equations using substitution.
y = -7x
2x - y = -9

Answers

Answer 1

Step-by-step explanation:

Since y= -7x you will want to substitute the y in the other equation.

2x -(-7x) = -9

2x + 7x = -9

9x = -9

so x will be -1

y= -7(-1)

x= -1

y= 7

Answer 2

Answer:

x = -1 , y =7      (-1,7)

Step-by-step explanation:

[tex]y=-7x\\2x-y = -9\\[/tex]

[tex]2x+7x = -9[/tex]

[tex]2x+7x = 9x\\[/tex]

[tex]9x = -9\\[/tex]

[tex]\frac{9x}{9} =\frac{-9}{9}[/tex]

[tex]x = -1\\[/tex]

[tex]y = -7(-1)\\y = 7[/tex]


Related Questions

At x= pi/4 , find the product (sin4x)(cos5x)

Answers

Answer:

zero

Step-by-step explanation:

x= π/4

sin(4x)*cos(5x) =sin(4*π/4)*cos (5*π/4) =sin(π)*cos(5π/4)

sin(π) = 0, therefore the product is also zero

Find the exact value of csc 5pi/6

Answers

Answer:

csc 2 (csc [tex]\frac{5\pi}{6}[/tex] = csc 150 = csc 30 = csc 2)

Step-by-step explanation:

csc [tex]\frac{5\pi}{6}[/tex] is in the 2nd Quadrant where only sin, and csc are positive.

csc [tex](\frac{5\pi}{6})=csc (\pi -(\frac{5\pi}{6}))=csc(\frac{5\pi}{6})[/tex]

but csc [tex]\frac{5\pi}{6}[/tex] = [tex]\frac{1}{sin (\pi/6)} = \frac{1}{sin 30} = \frac{1}{1/2} =2[/tex]

Which answer has been rounded to the whole number?
4.1
4.10
4.100
Or 4​

Answers

Answer:

4

Step-by-step explanation:

4 is a whole number

In mathematics, whole numbers are the basic counting numbers 0, 1, 2, 3, 4, 5, 6, … and so on. 17, 99, 267, 8107 and 999999999 are examples of whole numbers. Whole numbers include natural numbers that begin from 1 onwards. Whole numbers include positive integers along with 0.

Suppose f(x)=x+2. Find the graph of f(1/3x)

Answers

Answer:

f(x)=x+2.

f(1/3x)=1/3 x+2=(x+6)/3or x/3+2

Answer:

graph 3

Step-by-step explanation:

Please hurry; Which function increases the fastest? A. y 5 14x B. y 5 23 · 17x C. y 5 120x D. y 5 2275x^x

a y = 14^x
b y = -3 (17)^x
c y = 120x
d y = -275x

Answers

Answer:The given equation is of the form y = mx + b where m is the slope and b is the y-intercept.

Here, m = -14

Two parallel lines have the same slope. So, the slope of the new line will be -14.

To calculate the y-intercept substitute x=4 and y=4 in the equation.

4 = (-14)(4) + b

Solving for b, we get b = 60.

So, the new equation will be y = -14x + 60

Step-by-step explanation: pls brainlist

Can you help me on question one?!

Answers

Answer:

I believe the answer is C

Answer:

I think answer is C

Step-by-step explanation:

Becausr A B AND D ARE SAME FORM OF WRITTING

2) -88, 93, 4, 91, -15, 6
Answer:
3) 24. -42, 16, 8, 12, 38
Answer:
4) 92, 28, 32, 48, -5, -21
Answer:
5-16, -12, 6, 3, 10, -21
Answer:​

Answers

Answer:

Step-by-step explanation:

Huh

Which number is between 0.4 and 0.5?
A 0.04

0.44
0.05
0.50

Answers

.44 is the correct answer

Find the missing length of the triangle.
11.
26 in.
10 in.
у

Answers

144in

How to:
26 + 10 = 36
180 - 36 = 144✅

12 out of the 50 U.S. states have names that start with a vowel. What percentage of U.S. states' names start with a vowel

Answers

Answer:

24% of the U.S. states have names that start with vowels

Step-by-step explanation:

12 ÷ 50 = 0.24

0.24 × 100 = 24%

Answer:

24 % of the U.S. states' names start with a vowel

Step-by-step explanation:

12 out of 50 vcan be written in math terms as;

12 / 50 which equals the decimal form of a percent as shown;

12 / 50 = 0.24

which in percent form is: 24 %

1.
A bacteria sample is growing exponentially, as a seen in the table below.
Which exponential regression equation best represents this data? (Round values to the nearest tenth.)
a) y=22.3(1.4)^x
b) y=20.5(1.9)^x
c) y=15.1(0.8)^x
d) y=32.6(1.6)^x

Answers

Answer:

b) y=20.5(1.9)^x

Step-by-step explanation:

As per data in the table:

The initial number is 20The growth rate is about twice

This is best matching the function:

y = 20.5(1.9)^x

option b)

X+y = -15 in y = mx+b form

Answers

Answer:

y=-15x+b

Step-by-step explanation:

Just move it around and use a calucator

Identify the transformation shown by the 2 lines on the graph as a dilation or translation.
a) translation
b) dilation

Answers

Answer:

b) dilation

Step-by-step explanation:

Translation:

Figure has the same size, just in different positions.

Dilation:

FIgure has different size.

In this question:

We have function [tex]f(x) = x[/tex].

And also, we have function [tex]g(x) = \frac{x}{4}[/tex], that is, the figure f changes in size, is divided by 4. So it is a dilation.

24 + 8k = i dont know what it is

Answers

Answer:

Your answer is 8024 hope this helps

Step-by-step explanation:

Answer:

k = 3

Step-by-step explanation:

So i'm guessing you are solving for k so you divide 24 by 8 and you get 3

pls give me brainliest :)

Please anyone help its due will give brainlist please

⦁ Explain the difference between a linear expression and a linear equation. Use your Reference Book or https://www.mathsisfun.com/.
⦁ Write two different linear expressions that are equivalent (both expressions should be equal but not look the same).
⦁ Show or explain why the two expressions in part b are equivalent.

Answers

Answer:

An expression is a number, a Variable or a combination of numbers and variables and operation symbols. An equation is made up of two expression connected by an equal sign I hope this help

The distance between Philadelphia and Las Vegas is 8.5 inches on a map with a scale 1.5 in : 500 miles . What is the distance in miles?

Answers

Answer:

2833.3 miles

Step-by-step explanation:

Answer:

a. 2 inches = 1 mile

Step-by-step explanation:

Fracciones equivalentes a 3/10

Answers

Answer:

6/20, 9/30, 12/40, 15/50, 18/60, 21/70, 24/80, 27/90, 30/100

Como el 3 no tiene mitad y el 10 si no podemos poner 1.5/5 ya que no es una manera correcta de expresar la mitad de 3/10, asi que se multiplican el numerador y el denominador por 2:

3x2≈ 6 → numerador
10x2≈ 20 → denominador
∴∴∴∴∴∴∴∴∴∴∴∴∴∴∴∴∴∴∴∴∴∴∴∴∴∴∴∴∴∴∴∴∴∴∴∴∴∴∴
6x2≈ 12 → numerador
20x2≈ 40 → denominador
∴∴∴∴∴∴∴∴∴∴∴∴∴∴∴∴∴∴∴∴∴∴∴∴∴∴∴∴∴∴∴∴∴∴∴∴∴∴∴
12x2≈ 24 → numerador
40x2≈ 80 → denominador
∴∴∴∴∴∴∴∴∴∴∴∴∴∴∴∴∴∴∴∴∴∴∴∴∴∴∴∴∴∴∴∴∴∴∴∴∴∴∴

Tu puedes seguir buscando mas fracciones equivalentes, algunas fracciones equivalentes de 3/10 son: 6/20 , 12/40 y 24/80

Question Progress
Homework Progress
88 / 213 Marks
To complete a task in 16 days a company needs
5 people each working for 6 hours per day.
The company decides to have
8 people each working for 4 hours per day.
Assuming that each person works at the same rate,
how many days will the task take to complete?

Answers

Answer:

15 Days

Step-by-step explanation:

Formula:

M1D1H1=M2D2H2

Dan spent $765.00 on equipment to open a business selling burritos. He sells the burritos for $3.50 each. The cost of the ingredients to make each burrito is $0.75

Answers

What are you trying to find?

Please help me pleaseeeee

Answers

Answer:

1. tan

2. standard

3. y=16.8

Step-by-step explanation:

1. Trigonometic functions are:

sinA=opposite/hypoteneuse

cosA=adjacent/hypoteneuse

tanA=opposite/adjacent.

We have the opposite side (20) and the adjacent side (y), but not the hypoteneuse, ao we have to use tan.

2.Inverse is only used when we dont know the angle measure, so we use standard.

3.tanA=opp/adj

tan50=20/y

1.19175359259=20/y

y=16.7819926235 or 16.8

What is the decimal multiplier to decrease by 8. 4%

Answers

Answer:

0.916

Step-by-step explanation:

100-8.4

91.6%

What is the domain of f for f(x)=x-3/x+2?

Answers

Answer:

(-infinity, -2) ∪ (-2, infinity)

Step-by-step explanation:

I will have to assume that you meant

f(x)=(x-3)/(x+2).  You must use parentheses to specify the order of operations in this problem.

x can take on any value except -2, at which the function is undefined.

Thus, the domain is (-infinity, -2) ∪ (-2, infinity)

2.79 ? 2.790
Are they equal or which one is greater

Answers

Answer:

they are equal

Step-by-step explanation:

because you can add how many zeroes after 2.79 but it is going to still be equal.

slope = 3; (-2, -2)
plzz help

Answers

Answer:

[tex]y = 3x +4[/tex]

Step-by-step explanation:

Given

[tex]m = 3[/tex] --- slope

[tex](x,y) = (-2,-2)[/tex]

Required

Determine the equation and plot the graph

The formula for the equation is:

[tex]y = m(x - x_1) + y_1[/tex]

This gives:

[tex]y = 3(x - (-2)) - 2[/tex]

[tex]y = 3(x +2) - 2[/tex]

Open bracket

[tex]y = 3x +6 - 2[/tex]

[tex]y = 3x +4[/tex]

See attachment for graph

Solve this system by substitution. y = 6x - 6 y = -4x - 6 *Remember to write your answer as a coordinate point (x, y).​

Answers

Answer: (0, -6)

Explanation:
6x - 6 = -4x - 6
10x = 0
x = 0
y = 6(0) - 6
y = 0 - 6
y = -6

Simplify each of the fractions. If there is no answer, enter "undefined."
C. 16/0

Answers

1 whole???i’m not smart lol

please help i have more questions btw

Answers

The picture is blurry I can’t see

Answer:

B [tex]1/4^2[/tex] and A [tex]4^1/4^3[/tex]

Step-by-step explanation:

Solve the system using elimination.
SHOW ALL WORK on a separate sheet of paper.
52 - 2y = -48
2x + 3y = -23

Answers

Answer:

y=50 and x=-173/2

Step-by-step explanation:

52-2y=-48

∴-2y=-100

y=50

and 2x+3y=-23

y=50→(1)

2x+3y=-23→(2)

Putting y=50 in equation (2), we get

⇒2x+3y=-23

⇒2x+3(50)=-23

⇒2x+150=-23

⇒2x=-23-150

⇒2x=-173

⇒x=-173/2

∴y=50 and x=-173/2

Customers left Jill $2.50 as a tip. The tip was 20% of the total. How much was the bill?

Answers

Answer:

$12.50

Step-by-step explanation:

Answer:

The bill was $12.50

Step-by-step explanation:

Brainliest please... nvm

Pablo walks 1/2 mile to school and 1/4 of an hour. What is the unit rate in miles per hour?

Answers

Answer:

Unit rate = 2m/h

Step-by-step explanation:

Distance = 1/2 mile x 4 = 2 miles

Time = 1/4 x 4 = 1 hr

Unit rate = 2m/h

I hope im right!!

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