system-of-equation-determine-x-and-y-math-homework-help

Suppose that you have 12 coins, all nickels (5 cents apiece) and dimes (10 cents apiece) with a total value of $1.00. If x is the number of nickels in your pocket and y is the number of dimes, then what system of equation can be used to determine x and y? Please explain your answer.