I am pretty sure it is 2x - 7 ithink so not a 100 pecent sure
Convert the fractions into decimals:
7/8 = 0.875
11/10 = 1.1
0.875 is 0.125 away from 1
and 1.1 is only 0.1 away from 1
So 11/10 is closer to whole number 1
Define your variables:
Q: number of quarters
D: number of dimes
Next, create your equations
Q = 2D-4
25Q+10D=200
Because one variable (Q) is already written in terms of the other variable, D, you can already start solving with substitution.
25(2D-4)+10D=200
50D-100+10D=200
60D=300
D=5
Substitute D back into the other equation to find Q.
Q=2D-4
Q=2(5)-4
Q=6
Substitute D and Q into the second equation to check.
25Q+10D=200
25(6)+10(5)=200
150+50=200
This works, so the answer is right! Bill has 6 quarters and 5 dimes.
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