Math
posted by Jane .
Please explain how to solve this equation with substitution: The owner of a hair salon charges $20 more per haircut than the assistant. Yesterday the assistant gave 12 haircuts. The owner gave 6 haircuts. The total earnings from haircuts were $750. How much does the owner charge for the haircut? Solve by writing and solving a system of equations.

o=A+21
6o+12A=750
put the first equation into the second.
6(A+21)=12A=750
now simplify, solve for A.
Then, O=A+21