Answer:

Explanation:
we know that
A relationship between two variables, x, and y, represent a proportional variation if it can be expressed in the form
or

in this problem
For x=32, y=-4
Find the value of the constant of proportionality k

substitute

simplify

so
The linear equation is

Find x when the value of y=0
Remember that
In a proportional relationship the line passes through the origin
so
If y=0
then
the value of x must be equal to zero
therefore
