Question

Kat has 19 coins, all quarters and dimes, that are worth a total of $4. The system of equations that can be used to the number of quarters,q, and the number of dimes,d, she has shown

Answer 1

q + d=19 0.25q + 0.1d=4 
 (d) -0.1(q + d=19) 0.25q + 0.1d=4 Opposites cancel -0.1q -0.1 d=1.9 0.25q + 0.1d=4