Question

How do you find the value of r such the points (9,r), (6,3) with slope m=-1/3?

Answer 1

r=2

Explanation:

Slope of a line joining two points `x_1, y_1 and x_2 , y_2`

is `(y_2 -y_1)/(x_2 _x_1)`

Accordingly, `m= -1/3 =(3-r)/(6-9)`

Solve for 'r', cross multiply first

`(-1)(-3)= 3(3-r) -> 3= 3(3-r) -> 1= 3-r`

`r=2`