4x - 4y + 7 = 15
to get it into y-intercept form do this...
4x -4x - 4y + 7 - 7 = 15 - 7 - 4x
-4y = 8 - 4x
-4y / -4 = (8 / -4) + (-4x / -4)
y = x + 2
you did not give any values to plug in so this is as best an answer i can give
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2y = 4x + 4y = 2x + 2
x= -.5
16x+9 without the rest of the equation, what this equals, I can't solve
no 3x2=6 then 4x-15= -60 so 6 added with - 60 = -54
-2x = -4x + 24 -2x + 4x = 24 2x = 24 x = 24/2 x = 12