Khadija has $0.90 worth of nickels and dimes. She has a total of 10 nickels and dimes altogether. By following the steps below, determine the number of nickels, x, commax, and the number of dimes, y, commay, that Khadija has.
Determine three ways to have a total of 10 coins:
1) Khadija could have 5 nickels and 5 dimes.
2) Khadija could have 10 nickels and no dimes.
3) Khadija could have 8 nickels and 2 dimes.