SOLUTION: The length of a rectangle is 5x-7 and the width is 3x+2. Find the dimensions if the perimeter is 168 inches. What I did that my teacher marked wrong: 16x-10=168 16x=178 178/6

Algebra ->  Coordinate Systems and Linear Equations  -> Linear Equations and Systems Word Problems -> SOLUTION: The length of a rectangle is 5x-7 and the width is 3x+2. Find the dimensions if the perimeter is 168 inches. What I did that my teacher marked wrong: 16x-10=168 16x=178 178/6      Log On


   

Question 1107111: The length of a rectangle is 5x-7 and the width is 3x+2. Find the dimensions if the perimeter is 168 inches.
What I did that my teacher marked wrong:
16x-10=168
16x=178
178/6=
11.125*5-7 = 48.65
11.125*3+2= 35.375
When you add it, it doesnt total 168. Please help Ive been on this for ages
Answer by josgarithmetic(39630) About Me  (Show Source):
You can put this solution on YOUR website!
GIVEN: LENGTH IS 5x-7 AND WIDTH IS 3x+2.

2%285x-7%29%2B2%283x%2B2%29=168-----------THIS ACCOUNTS FOR THE PERIMETER.
-
5x-7%2B3x%2B2=84
8x-5=84
8x=89
highlight_green%28highlight%28highlight_green%28highlight%28x=89%2F8%29%29%29%29
and YOU can continue to EVALUATE LENGTH AND WIDTH.

LOOK Carefully at your computations for length and width. You made a mistake in arithmetic for the length and have almost the correct value. Your width value IS correct.