If y = 4x then there is no y intercept because the line passes through the origin.
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If you mean: y = -4x then the slope is 4 and the y intercept is -2
If you mean: 4x+8y = 12 then the y intercept is 12
x-intercept of y equals -4x plus 4 y = -4x + 4 0 = -4x + 4 -4 = -4x 1 = x So 1 is the x-intercept
y = -4x The y-intercept is zero. That is, the graph passes through the origin.