Marlene and Leony have $365 altogether. If Leony spends $100, she will have $5 less than Marlene. How much money does Marlene have?
L = 365 - M
L - 100 = M + 5
Substitute 365-M for L in the second equation and solve for M.
L - 100 = M + 5
Substitute 365-M for L in the second equation and solve for M.