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8. * The functions f(x) and g(x) are both linear. f(2) = 4 and f(3) = -1, while g(2) = 6 and g(-3) = 7. Are these lines parallel, perpendicular, or neither? Show your work algebraically. 9. ** f(x) = 5x – 2 and g(x) = 2x + 4. Are f(x) and g(x) parallel, perpendicular or neither parallel nor perpendicular to each other. Justify.

Sagot :

[tex]\begin{gathered} \text{for the line f we have 2 points:} \\ (x_1,y_1)=(2,4) \\ \text{and} \\ (x_2,y_2)=(3,-1) \\ \text{hence, the slope} \\ m=\frac{y_2-y_1}{x_2-x_1} \\ is\text{ given by} \\ m=\frac{-1-4}{3-2} \\ m=-\frac{5}{1} \\ m=-5 \\ \text{now we ne}ed\text{ to find the slope for g} \end{gathered}[/tex][tex]\begin{gathered} \text{For g we have 2 points:} \\ (x_1,y_1)=(2,6) \\ (x_2,y_2)=(-3,7) \\ \text{hence, the slope is given by} \\ m=\frac{7-6}{-3-2} \\ m=\frac{1}{-5} \end{gathered}[/tex][tex]\begin{gathered} \text{parallel lines has the same slope.} \\ \text{perpendicular lines has reciprocal negative slope}\colon \\ m\Rightarrow-\frac{1}{m} \\ IN\text{ THIS CASE, they are neither parallel nor perpendicular since} \\ m=-5 \\ \text{and} \\ m=-\frac{1}{5} \\ \text{are not perpendicular } \end{gathered}[/tex]