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OpenStudy (anonymous):
A box contains 35 coins in quarters and nickels worth $3.15 How many of each coin are there (system of liner eqations problem)
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OpenStudy (anonymous):
Q + N = 35 25Q + 5N = 315.
OpenStudy (anonymous):
Simplyf the second equation, solve the first for one of its unknowns and substitute into the simplified second equation, and you're well on your way to the solution.
OpenStudy (anonymous):
careful with the decimals! \[25q+5(35-q)=315\] \[
OpenStudy (anonymous):
\[20x+175=315\] \[20x=140\] \[x=7\]
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