Q. If the straight line, $2 x - 3 y + 17 = 0$ is perpendicular to the line passing through the points $(7, 17)$ and $(15, β$ ), then $β$ equals :

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A

$- 5$

17%

B

$- \frac{35}{3}$

21%

C

$\frac{35}{3}$

28%

D

$5$

33%

Solution:

$\frac{17 - β}{- 8} \times \frac{2}{3} = - 1$