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## cieracabrera one year ago x+y=-7 2x-y=-8

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1. shamil98

I'm guessing you want to solve the system.

2. shamil98

To do so just add the equations. $\huge \left(\begin{matrix} x+y = -7 \\ 2x-y=-8\end{matrix}\right)$

3. shamil98

What do you get?

4. cieracabrera

you would get 2x=-15 i think cuz you cross out either the x or y

5. cieracabrera

i cross out the y

6. Hidden_Twilight

x+y=-7 2x-y=-8 ---------- 3x - 0 = -15 i though it was supposed to be 3x = -15 also, simplify it by dividing both sides by 3 and you get x = -5

7. shamil98

Correct, you cross out the y but you forgot to add the x. you get as twilight mentioned 3x = -15 from there you divide by 3 to both sides to get your x value of -5.

8. shamil98

x + y = -7 -5 + y = -7 y = -2

9. shamil98

(-5,-2) is your solution set to your system.

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