posted by trixie on .
Create a linear system to model this situation. Then use substitution to solve the linear system to solve the problem.
- Bobbie has been saving dimes & quarters to buy a new toy. She has a total of 28 dimes and quarters, with a value of $4.30. How many of each type of coin does Bobbie have?
dimes --- x
quarters ---- 28-x
10x + 25(28-x) = 430