Question

If Liam arranges chairs in 9 rows of the same length he has 3 chairs left over if he arranges the chairs in 7 rows of that same length he has 19 left how many chairs does he have

Answer 1

75 chairs

Explanation:

let x=number of chairs per row

let y=total number of chairs

use linear function:

y=9x+3

y=7x+19

9x+3=7x+19

9x-7x=19-3

2x=16

x=8

plug 8 into either equation

9×8+3=75

7×8+19=75