Question

What is the value of r if the line that passes through ( 4,3 ) and ( -5,r ) has a slope of -1

Answer 1

Answer:

r= 12

Step-by-step explanation:

Slope= $\frac{y1 - y2}{x1 - x2}$

Using the formula above,

$\frac{r - 3}{ - 5 - 4} = - 1 \\ \frac{r - 3}{ - 9} = - 1 \\ r - 3 = - 1( - 9) \\ r - 3 = 9 \\ r = 9 + 3 \\ r = 12$