Desperate for an answer!!!

Question

Matthew has 9 five dollar bills and ten dollar bills in his wallet. The total amount in his wallet is 60. Write a system of equations to represent this situation. Then solve the system of equations by graphing. Explain what the solution means.

Answer 1

Let x be the number of five dollar bills and y be the number of 10 dollar bills.

Then x + y = 9

Also, if you's like to determine the value of the money in his wallet you would multiply the number of five dollar bills (x) by 5 and add that to the number of ten dollar bills (y) multiplied by 10 or:

5x + 10y = 60

Graph each line and look for the place the two lines cross. That is the point where both conditions are being met.