Question

Given the perimeter and side lengths, write and equation to represent the perimeter of the rectangle.
Solve for x,showing your work.
P=38 units. 3x-9. X

Answer 1

perimeter is all the way around 2(length + width)
38 = 2{(3x-9) + x }
x=7

Answer 2

Can you show your work

Answer 3

38 = 2(4X - 9)
38 = 8X -18
38 + 18 = 8X -18 + 18
56 = 8X
56/8 = 8X/8
X = 7
3X - 9 =3(7) -9 = 21-9 = 12
TO CHECK 12 +12 +7 +7 = 38