A straight line, at an inclination of 45 degrees (from SW to NE) if the scales for the two axes are the same.
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The coordinates of the x intercept for the equation y equals x plus 1 is (x=-1, y=0).
If the equation is: y = -x then the slope is -1 and there is no y intercept
x=3 y=3.5
It is a linear equation in the variables x and y.
y equals x plus 5 is the equation of a straight line in the x-y plane.