In this case, we'll have to carry out several steps to find the solution.
Step 01:
Data:
piggy bank:
quarters and dimes = $5.10
# quarters and dimes = 27
Step 02:
system of equations:
quarters = q
dimes = d
equation 1:
q + d = 27
equation 2:
0.25q + 0.10d = 5.10
The answer is:
q + d = 27 eq.1
0.25q + 0.10d = 5.10 eq.2