Question

PLZZZ HELP pictures down below

Answer 1

C

Explanation:

We can multiply each equation by a constant so they'll equal either 15 or -15 since that is the LCM.

Since the answer choices want us to make the top a negative 15, we'll do that.

`2x-5y=-21 \\ \\ 3(2x-5y)=(-21)*3 \\ \\ 6x-15y=-63`

To make the y's cancel out, the second equation would have to have the y's coefficient equal 15.

Let's do that.

`3x-3y=-18 \\ \\ -5(3x-3y)=(-18)*-5 \\ \\ -15x+15y=90`

So the resulting equations are answer choice C.