This is not right as 10x7 is 70 and 8x13 is 104 the equals means they should both have the same answer. hope this helps ;)
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If: y = 8x+7 then the y intercept is 7 and the slope is 8
-8x+7 = -7x-2 -8x = -7x-2-7 -8x=-7x-9 -8x+7x=-9 -1x=-9 x=-9/-1 x=9
x=-3
72
X=6