Solve the linear system of equations using the linear combination method. {4x−9y=202x−6y=16 enter your answers in the boxes. x = y =

A

Step-by-step explanation:

-4.5, 4.25

The correct answer is:

x = -4; y = -4

Explanation:

We are going to eliminate the variable x. In order to do this, we are going to make the coefficients the same by multiplying the second equation by 2:

In order to eliminate x, we must subtract the transformed second equation from the first:

Divide both sides by 3:

3y/3 = -12/3

y = -4

Substitute this into the first equation:

4x-9y = 20

4x-9(-4) = 20

4x--36 = 20

4x+36 = 20

Subtract 36 from each side:

4x+36-36 = 20-36

4x = -16

Divide both sides by 4:

4x/4 = -16/4

x = -4

first option

a function is a relation in which an input is paired with exactly one output.

so, let's find the right answer.

in our first option, our inputs are january, february, and march. the outputs are 30, 28, and 25. each input has it's own output. this is correct!

our second option we know is incorrect, because ms. valverade has two outputs, dogs and cats. this is not a function.

our third option is incorrect as well. the yellow square has two ouputs, the square and the triangle.

lastly, in our fourth option, we see the number 7 two times with a different output. therefore, this is not a function.

remember: each input must be paired with only one output!

after simplifying it i got: -36.25 as my answer. hope that !