,

Eliminate the equal sides of each equation and combine.

Subtract from both sides of the equation.

Subtract from .

Subtract from both sides of the equation.

Subtract from .

Divide each term in by .

Cancel the common factor of .

Divide by .

Replace all occurrences of in with .

Multiply by .

Add and .

Solve by Substitution p=-0.3x+6 , p=0.15x+1.5