Question

Irina has 10 coins, all nickels and dimes, worth a total of $0.70. This is shown by the system of linear equations, x + y = 10 and 0.05x + 0.1y = 0.7 How many nickels does she have? 4 6 7 10

Answer 1

6 nickels- 6+4=10, .05(6)+.1(4)=.7
                                .3+.4=.7