Question

find the dimensions of a rectangle with a perimeter of 780m if the length is 15 more than 4 times the width.

Answer 1

2L+2W=780

L=4W+15
2(4W+15)+2W=780
8W+50+2w=780
10W+50=780
10W=730
W=73, substitute this back into either original equation to find L,
L=307