Jon used a gift card to pay for an $17 shirt. The remaining balance on the card is $31. Write and solve an equation that represents this. *

48-17=31

Step-by-step explanation:

So initially Jon had a balance of $48 and spent $17 leaving him with $31.

X = pencils, y = pens

17x + 18y = 61.50multiply by 21
10x + 21y = 57 multiply by -18

357x + 378y = 1291.5 (result of multiplying by 21)
-180x - 378y = - 1026 (result of multiplying by -18)
add
177x = 265.5
x = 265.5 / 177
x = 1.50 <== cost for a pencil
pens(y) cost 2.00