This is the equation of a line in which the slope is 1 and the y-intercept is -4.
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8
x=4 y=4
y=8 y = 2x y = 2(4) <-- substitute 4 for x y = 8 <-- this is your answer
If x=4... then 'y' MUST equal 3 !
So -3x - 6 = x - 4, ie -2 = 4x so x = -½ and y = -4½