Question

Kara has 21 collectible buttons to sell. She sells the small buttons for $3 and the large buttons for $4, and earns a total of $68. If the small buttons are represented by x and the large buttons are represented by y which of the following systems of equations can be used to calculate the number of large and small buttons sold.

Answer 1

x+y=21
3x+4y= 68

-3x-3y=-63
3x+4y= 68

y= 5 large buttons

x + 5= 21

x= 16 small buttons