Mathematics High School

Find the solution of the system of equations -7x-3y=-20 3x+6y=-15

Answers

Answer 1

9514 1404 393

Answer:

  (5, -5)

Step-by-step explanation:

I like a graphing calculator for quickly finding a solution to a system of equations. It shows the solution to be (5, -5).

__

We can add the second equation to 2 times the first to eliminate the y-variable.

  2(-7x -3y) +(3x +6y) = 2(-20) +(-15)

  -11x = -55 . . . . . collect terms

  x = 5 . . . . . . . . . divide by -11

Substituting this value into the second equation, we have ...

  3(5) +6y = -15

  6y = -30 . . . . . . . . subtract 15

  y = -5 . . . . . . . . . . divide by 6

The solution is (x, y) = (5, -5).

Find The Solution Of The System Of Equations -7x-3y=-20 3x+6y=-15

Related Questions

Tell whether the ordered pair is a solution of 4y + y >-1,

Answers

Answer:

try y>-1/5

Step-by-step explanation:

com/forms/d/e/1FAIpQLSeaV3E4GEivw--oxpi043rlf3g1huKMHD79-ccdtkntgEc32g/viewform?hr_submission=Cho
Question 2: Using the following data [2.5 kg, 3.1 kg, 3.4 kg, 3.5 kg, 3.5 kg, 4 kg,
4.1 kg] calculate the interquartile range
I need the lower quartile upper quartile and the interquartile range

Answers

Answer:

interquartile should be 3.45kg

lower quartile is 2.8kg

upper quartile is 3.75kg

pls help me out i’ll give brainliest

Answers

Answer:

I believe it is 51.2 I think but yeah

Answer:

-4.75

Step-by-step explanation:

We're trying to find the number that's between -4 and -5. B is on -4.5, so we need to find a number between -4.5 and -5. This would be -4.75. Think of it like quarters, 4 quarters equal a dollar, and B would be the 2nd quarter (which is 50 cents). D would be the 3rd quarter (which is 75 cents). That's where the ".75" comes into the answer "-4.75". Just remember to put NEGATIVE 4.75 and NOT positive 4.75 since this is a negative number.

Hope this helped you!


What are the values of a and b, and what is an equation for the line?

Answers

Answer:

a = 1,  b = 6

Step-by-step explanation:

slope of line = (5-2) / (12-3) = 3/9 = 1/3

(3-2) / (b-3) = 1/3

b-3 = 3        b = 6

(2-a) / (3-0) = 1/3

2-a = 1          a = 1

Please help if you can, thanks

Answers

Answer:

what does the picture say

What is the midpoint of the segment with endpoints M(-5, 2) and N (9, -19)?

Answers

Answer:

Step-by-step explanation:

Solve for b
-11b+7=40
B=

Answers


Subtract 7 from both sides. Then divide by -11 on both sides. Remember: a positive mult./divide by positive equals a positive answer. Same works for negatives. If a positive and negative are used, then the answer is negative. I’ve attached the work.

What is the equation of the line shown in this graph?

Answers

The answer to the graph is y=1

abc is a right angled triangle calculate the angle of ac

Answers

Answer:

[tex]Solution,\\In~triangle~ABC,\\cosA = \frac{Base}{Height} \\or, cos65^o=\frac{AB}{AC} \\or, cos65^o = \frac{5}{AC} \\or, AC = \frac{5}{cos65^o}\\or, AC = 11.83m[/tex]

James wants to buy a house.
The price of the house is a quarter of a million pounds.
James has to pay a deposit for the house.
The deposit is 15% of the price of the house.
James already has part of the deposit.
He has £32 000
(a) How much more money does James need for the deposit?

Answers

Answer:

27,200

Step-by-step explanation:

15% of 32,000 pounds is 4,800. Just subtracting them will end you with 27,200.

27,700
Will be the answer for this question


⚠️help!!⚠️ i’ve been stuck for 15 minutes!

Answers

Answer:

y=2x−5 is a line

Step-by-step explanation:

Explanation: y=2x−3 is in slope intercept form for a linear equation, y=mx+b , where m is the slope and b is the y-intercept. The y-intercept is the point at which x=0 and y=−3 , which is point (0,−3) You can plot this point on your graph.

x =

9
7
4
LOOK AT IMAGE

Answers

thy answer is 4
need character limit

The distance from the ladder to the end of the side is 5 ft. The distance from the top of the ladder to the bottom is 13 ft long! HOW TALL IS IT? WILL MARK BRAINLIEST

Answers

Answer:

12 ft

Step-by-step explanation:

Note that you have a right triangle here, with hypotenuse 13 ft, and base 5 ft.  Using the Pythagorean Theorem, we find the height of the upper tip of the ladder as follows:

(13 ft)^2 = y^2 + (5 ft)^2.  Then y^2 = 144 ft^2, and y =height= 12 ft

please help, this is due in a few minutes and i’ll be giving points and brainlest, thank you so much !!

Answers

Answer:

b

Step-by-step explanation:

Compare using <, >, or =. 3/6___3/7

Answers

3/6<3/7

Step-by-step explanation:

3/7 is more than 3/6 because the bigger mouth of a crocodile goes to the bigger piece of the food basically saying that 3/7 is bigger.

Answer:

3/6<3/7

Step-by-step explanation:

what is 11X12+245-66 x 8. please help

Answers

Answer:

2488

Step-by-step explanation:

11 x 12 = 132

132 + 245 = 377

377 - 66=  311

311 x 8 = 2488

Consider the expression 635,943÷77. Complete the equation below by estimating the dividend and divisor in the expression to show that the quotient is about 8000

Answers

Answer:

8259

Step-by-step explanation:

Help me please I’m struggling

Answers

Answer:

305

Step-by-step explanation:

sorry if im not right

Which values from the set {0, 1/2 , 2.5, 4} make the inequality 8g < 4 true?

Answers

Answer:

only 0

Step-by-step explanation:

8g < 4 simplifies to g < 4/8, i.e., g < 1/2

only 0 is smaller than 1/2

Which of the following word problems can be solved using the equation 10 x - 15=60

Answers

Answer:

Kit buys

Step-by-step explanation:

im right

help will give brainliest!!! the triangles shown below are similar. which line segment correponds to ac? refer to picture

Answers

DE is your answer I hope I helped

72 is what percent of 35?

Answers

answer:48.611111111111%

11points HELP PLZ!!!

Answers

Answer: 0.00215

Step-by-step explanation:

10^-3 =0.001

2.8 • 0.001 - 0.00065

=0.00215

Answer:

2.15 × 10⁻³

Step-by-step explanation:

Move the decimal so there is one non-zero digit to the left of the decimal point. The number of decimal places you move will be the exponent on the

10. If the decimal is being moved to the right, the exponent will be negative. If the decimal is being moved to the left, the exponent will be positive.

Why is it important to be careful of the order of the two letters used when naming a ray?

Answers

Answer:

Because one letter represents an endpoint and the other doesn't.

Step-by-step explanation:

Ray AB starts at endpoint A and goes through point B and then on, indefinitely.

Ray BA starts at endpoint B and goes through point A and then on, indefinitely.

They 'point' in opposite directions.


Which equation represents a line that is perpendicular to the y-axis?
A.y= 9x
B.x= 15y
C.y = -8
D.x= -17

Answers

Answer:

C, [tex]y=-8[/tex]

Step-by-step explanation:

[tex]y=-8[/tex], is a horizontal line, which makes it vertical to the y-axis

96/134x5 +8 i need this good grade plz

Answers

11.6?? Maybe I’m not sure what format you need it in?

the perimeter of a square is 7.2 meters how long is each side ?

Answers

Answer:

1.8 meters

Step-by-step explanation:

7.2÷4= 1.8

Answer:

1.8 m

Step-by-step explanation:

let side be 'a'.

perimiter of a square = 4(a)

7.2 = 4(a)

7.2/4 = a

therefore, a = 1.8 m.

A vendor bought 80 pineapples ₱18.50 each. Three pineapples got rotten, but then he sold the rest at ₱25.00 each. how much did he gain?​

Answers

Answer:

₱445

Step-by-step explanation:

₱18.50(x)

x = number of pineapples purchased

₱18.50(80) = ₱1480

80 - 3 = 77

₱25.00(z)

z = number of pineapples resold.

25.00(77) = ₱1925

₱1925 = ₱1480 = ₱445

POSSIBLE POINTS: 6.67
0
Ross is working on a project for art class using a computer graphics program. Ross wants to
create a rectangular framework for the final graphic. The area to be enclosed by the
framework is represented by the expression 5x2 + 8x - 4. What expressions can be used to
represent the length and width of the rectangular framework?

Answers

the expression for this question of 5x3+8x - 4 would be

solve the equation log2 x - 1/2 * log2 (x + 1) = 1

Answers

Answer:

0

Step-by-step explanation:

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