Question

find the cost of 5 pens and 3 pencils

Answer 1

pen = 2x+3
&
pencil = y-3

5pens = 5(2x+3)
= 10x+15
3pencils
=>
3(y-3)
=3y-9
cost = pens + pencils
=10x+15+3y-9
10x + 3y + 15 - 9
= 10x + 3y +6

Hope it's helpful