Solve

p=3r-8 and 2r-p=22

3r-p=8 ... 1

2r-p=22 ... 2

Subtracting both the equation we get,

r = - 14

Substituting 'r = - 14' in any one equation (lets say equation 1) we get,

3 (-14) - p = 8

-42 - p = 8

-42 - 8 = p

p = - 50