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Finding the slope and y-intercept for x = -9, I beleive is (-9, 0) and the slope is undefined.

However what if you are looking for the slope and y-intercept of y = x?

Hmmm. It is a vertical line, so you are right, slope is undefined.

Now y=x is easy

Rewrite it as
y= 1*x + 0

slope is 1, y intercept is zero.

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