Advanced Math practice question

Answer: 6

(x² − 9) − (x² − 6x + 9) = 6x − 18: a line with slope 6.

Common wrong answers

If you answered 1

1 would be the slope if the x² terms had not cancelled and been mistaken for a line.

If you answered -18

−18 is the y-intercept, not the slope.

If you answered -6

−6 has the wrong sign; subtracting −6x gives +6x.

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