Question

A rectangle has a length of 2x + 7 and a width of 3x + 8y. Write and simplify an expression for the perimeter of that rectangle.

Answer 1

This is your information...
Length: 2x + 7 
Width: 3x + 8y 
Perimeter: 2(l + w) ...or... 2l + 2w
Now let's substitute...
2(l + w)
l = 2x + 7
w = 3x + 8y
2(2x+7+3x+8y)
Now combine the like terms: 
2(5x+7+8y)
Now distribute the number 2:
10x+14+16y
That is the perimeter
I HOPE THIS HELPED!!!! :D ;D