Answer :

[tex]\begin{gathered} m=\frac{rise}{run} \\ rise=y2-y1 \\ run=x2-x1 \end{gathered}[/tex]

For the red line:

[tex]\begin{gathered} rise=4-(-2)=6 \\ run=2-0=2 \\ m=roc=\frac{6}{2}=3 \end{gathered}[/tex]

For the blue line:

[tex]\begin{gathered} rise=-8-4=-12 \\ ru_{}n=-4-0=-4 \\ m=roc=\frac{-12}{-4}=3 \end{gathered}[/tex]

Therefore, they have the same roc

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