Jerry has 60 coins consisting of quarters and dimes. The coins combined value is $9.45. Find out how are quarters and how many are dimes.

Eq. 1.10x +.25y = 9.45

Eq. 2 x + y = 60 rewrite as x = 60 - y and substitute into equation 1.

.10 (60 - y) +.25y = 9.45

6 -.1y +.25y = 9.45

6 +.15y = 9.45

.15y = 3.45

y = 23

60 - 23 = 37

23 quarters

37 dimes

23 *.25 = 5.75

37 *.1 = 3.70

5.75 + 3.70 = 9.45