If you mean: 2y = x-4 then y = 0.5x-2 whereas the slope is 0.5 or a 1/2 and the y intercept is -2
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The slope is -0.2
Without an equality sign it is not an equation but when a straight line equation is parallel to another straight line the slope remains the same but the y intercept is different
x = -3 represents a vertical line whose slope is undefined.
There is no "equals" sign therefore "x-9" is NOT an equation.
-1/5