00:02
For this problem, we have the perimeter of a rectangle is 44 kilometers, and we're given that the area of this rectangle is 120 kilometers.
00:19
So whenever you're given a problem like this, the first thing is to write out what are the formulas for the parameter and area.
00:28
So because we're talking about a rectangle, we have two times width plus two times length, equals our parameter, which is 44.
00:43
And then area of a rectangle is just width times length, and that's going to be equal to 120.
00:57
Okay.
00:58
So from here, i'm going to solve, can we pick an equation just to solve for a variable? so i'm going to pick my top equation.
01:08
So first step i'm going to do is i'm going to divide by 2 and then subtract l.
01:13
So i'm going to have w is equal to negative l plus 22.
01:20
Okay, so if i come down to my other equation and plug that in, i'm going to have my parentheses where i'm plugging in w times l equals 120.
01:36
So negative l plus 22...