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when using the general equation for a line(y=m*x+n) you can only assign one y-value to each x-value. in your case f(-8) would equal -5 and -9, which is two instead of one

-> that means it's a vertical line. the equation would be x=8.

by the way the slope is not defined, because:

m = Δy/Δx

m = infinity/0 = undefined

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16y ago

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