Answer:
p= -3/4r+9
Explanation:
1. Subtract 3r from both sides of the equation to isolate p on one side of the equation
a. 4p+3r - 3r= 9 -3r
b. 4p=9-3r
2. Divide every term in the equation by 4
a. 4p/4=9/4 - 3r/4
b. p=9/4 -3r/4
3. Rearrange the equation (if need be) into slope-intercept form.
a. p= -3r/4 +9/4