No it is not an undefined slope; the slope of y = -x is -1.The standard form of a linear equation is y = mx + b, where m is the slope, and b is the y-intercept. In y = -x, the y-intercept is 0, and the slope is -1.
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then the slope is x=y. there is no slope.
x = -3 produces a vertical straight line parallel to the y axis with an x intercept at -3. A vertical line has an infinite (undefined) slope.
Without an equation, you know nothing about the slope of a line just because x equals 0. Slope is the change in y value divided by the change in x value over a segment of a line. When you only have a single x value, there is no change so the slope is undefined. Or if you are stating the value of x is 0 for all values of y, then the slope is infinite.
y=x y=1x The slope is one.