x = number of dimes y = number of quarters --- 10x + 25y = 2565 y = x + 20 --- put the system of linear equations into standard form --- 10x + 25y = 2565 x - y = -20 --- copy and paste the above standard form linear equations in to this solver: https://sooeet.com/math/system-of-linear-equations-solver.php --- solution: x = 59 y = 79
