Question

In given figure trapezoid $ABCD$ is graphed in the standard $(x,y)$ coordinate plane. What is the slope of $\overline{CD}$

• A. $-3$
• B. $-1$
• C. $1$
• D. $\frac{5}{21}$
• E. $\frac{3}{2}$

Answer 1

The correct option is B $-1$

The line $CD$ is passing through $(9,4)$ and $(12,1)$

Slope of the line passing through two points will be

$m=\frac{y_2-y_1}{x_2-x_1}$

So, slope will be $m=\frac{1-4}{12-9}$

$\Rightarrow m=-\frac{3}{3}=-1$