Verified Answer :

Simple....

using the formula \(\frac{ y_{1}- y_{2} }{ x_{1}- x_{2} }\) to find slope....

1.)  (9,2)(4,3)

\(\frac{2-3}{9-4}= -\frac{1}{5}\) (No)

2.)  (9,2)(3,4)

\(\frac{2-4}{9-3} = -\frac{2}{6} =- \frac{1}{3}\) (No)

3.)  (2,9)(3,4)

\(\frac{9-4}{2-3} = \frac{5}{-1} =-5\) (No)

4.)  (2,9)(4,3)

\(\frac{9-3}{2-4} = \frac{6}{-2} =-3\) (YES!)

Thus, your answer.

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