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Anonymous
y= -25
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Add: 5x - y + x + y + 8 + 10 ie 6x = 18 so x = 3 and y = 7
If: y = 8x+7 then the y intercept is 7 and the slope is 8
3 + Y where Y = 7 Substitute 7 for Y (because Y = 7) so: 3 + 7 = 10.
Y=5
(5, 1)