y = 3x
5x - 4y = 21
The system of equations above has solution (x, y).
What is the value of x + y?

Answers

Answer 1

Answer:

-12

Explanation:

We are given information to solve for 2 variables x and y. To solve this I substituted 3x for y in the equation 5x - 4y = 21

So substituting gets us 5x - 4(3x) = 21

and we can solve the equation for x

5x - 12x = 21

-7x = 21

x = -3

Now that we have found x, we can find y simply by putting it in the equation y = 3x

y = 3(-3) = -9

Once we have both variables, we can find the answer to x + y

-3 + -9 = -3 - 9 = -12

So the answer to the question

x + y = -12


Related Questions


1. Ten school children are asked to stand in a line to wait for ice cream cones.
A "line" in this case is a permutation because the order makes a difference. If
Raquel is first in line, that's different than being second or last. How many
different lines are possible for these 10 children?

Answers

Answer:

There are 3628800 possible number of arrangements

Explanation:

Given

Number of children = 10

Required

Possible number of arrangements

From the question, we understand that the order of arrangement matters;

So; to solve this, we make use of the following formula

[tex]n! = n * (n-1) * (n-2) * ..... * 3 * 2 * 1[/tex]

In this case, n = 10

[tex]10! = 10 * 9 * 8 * 7 * 6 * 5 * 4 * 3 * 2 * 1[/tex]

[tex]10! = 3628800[/tex]

Hence, there are 3628800 possible number of arrangements

Identify whether each example is a job change, or a career change. Taryn is a Salesperson who leaves a job at a grocery store and takes a job at a department store: Monika is a High School Principal who takes a new job at a different high school: Justina is a Carpenter who takes a job as an Electrician: Odell is a Flight Attendant who undergoes training and becomes an Airline Pilot: Archie is a Registered Nurse who leaves his job at a hospital and goes to work at a nursing home: Frederick is a Bank Teller who takes a job as a Cashier:

Answers

Answer:

Taryn is a Salesperson who leaves a job at a grocery store and takes a job at a department store: Job change.

Monika is a High School Principal who takes a new job at a different high school: Job change.

Justina is a Carpenter who takes a job as an Electrician: Career change.

Odell is a Flight Attendant who undergoes training and becomes an Airline Pilot: Career change.

Archie is a Registered Nurse who leaves his job at a hospital and goes to work at a nursing home: Job change.

Frederick is a Bank Teller who takes a job as a Cashier: Job change.

Explanation:

A job change is when there is a change in the job/ place of work but the person still retains or does the same work, but just in a new environment. Whereas a career change is when the person changes his field of expertise or interest from one field to another, thereby making a complete overhaul of things. This may not necessarily involve a change in the workplace.

In the case of Taryn, Monika, Archie, and Frederick, their jobs remain the same even when they change their workplace. Taryn change from a grocery store to a department store, Monika from one high school to another, Archie from a job as a registered nurse in a hospital to a nursing home while Frederick changes from a Bank Teller to a cashier.

Whereas, Justina's case of changing from a carpenter to an electrician and Odell's job as an Airline Pilot from a Flight Attendant are examples of career changes.

Answer:

1. job change

2. job change

3. career change

4. career change

5.job cange

6. career chnage

Explanation:

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