Grace has xx pennies and yy nickels. She has at least 20 coins worth a maximum of $0.40 combined. Solve this system of inequalities graphically and determine one possible solution.

5 nickels

15 pennies

Step-by-step explanation:

x + y = 20

0.01x + 0.05y = 0.40

y = 20 - x

0.01x + 0.05y = 0.40

0.01x + 0.05(20 - x) = 0.40

0.01x + 1 - 0.05x = 0.40

0.01x - 0.05x = 0.40 - 1

-0.04x = -0.6

-0.04x/-0.04 = -0.6/-0.04

x = 15

x + y = 20

(15) + y = 20

y = 20 - 15

y = 5