Posted by ryan on .
Bobbie has 45 coins in dimes and quarters. The total value of the coins is $7.65. How many quarters and dimes does have?

algebra 1 part 2 
PsyDAG,
q + d = 45
q = 45d
10d + 25q = 7.65
Substitute 45d for q in last equation and solve for d. Insert that value into the first equation and solve for q. Check by inserting both values into the last equation.