Y=-3.
-8 on both sides and divide by3
-10 = 8 + 3y
-18 = 3y
-6 = y
or
y = -6
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y=8
are you talking about a system of equations where x+3y=-7 -x+2y=-8 if so, then the answer is {2,-3}
The slope is -2
yes
Subtract the second equation, giving -18 = y so x = -46