Y is undefined because the line x=1 never crosses the y axis.
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solution: y = 0 x = -1
If: x = -5 Then: y = (3*-5)-1 = -16
If y(x) = 1/3x, y(-18) = 1/[3(-18)] = -1/54.
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The coordinates of the x intercept for the equation y equals x plus 1 is (x=-1, y=0).