Can someone help me I’m supper confused

Let x represent the cost of a slice of pizza and let y represent the cost of a hamburger. 7 hamburgers and 3 slices of pizza cost $19, i.e. the $20 you paid minus the $1 change. 8 hamburgers and 2 slices of pizza cost $19.50. So:
3x+7y=19 and 2x+8y=19.5
Solve the system for the values of and . Multiply by 3 and multiply by 5, then add the two products. Subtract the sum from $20 for your answer.

Do the math. she originally had 50 dollars on her gift card and she had 12 dollars left on her gift card after she finished her shopping spree. if you subtract 50 minus 12 you get thirty eight dollars as your answer. so therefore, ciara spent 38 dollars total o