Question

A box contains 35 coins in quarters and nickels worth $3.15 How many of each coin are there
(system of liner eqations problem)

Answer 1

Q + N = 35
25Q + 5N = 315.

Answer 2

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.

Answer 3

careful with the decimals!
\[25q+5(35-q)=315\]
\[

Answer 4

\[20x+175=315\]
\[20x=140\]
\[x=7\]