use substitution to solve the linear system

3x-y=15
x+2y=-2

Solve for y in one formula, and then substitute that value for y in the other formula to solve for x. Once you find x, substitute that value into either formula to get the value for y.

2y = -2 - x

y = (-2-x)/2 = -1 - x/2

I will let you do the rest.

I hope this helps. Thanks for asking.

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