Question

The slope of the line joining the points $(k-4,3)$ and $(-5,7)$ is 4 . Find $k$.

• A. -2
• B. -15
• C. 15
• D. 2

Answer 1

Answer: (A)

$\text{ Slope }=\frac{7-3}{-5-k+4}$
$\Rightarrow 4=\frac{7-3}{-5-k+4}$
$\Rightarrow -4k-4=4\Rightarrow -4k=8\Rightarrow k=-2$