00:01
In this problem, we're given the formula to find the perimeter of a rectangle.
00:03
It's p equals 2 times l plus 2 times w, where p is the perimeter, l is the length, and w is the width.
00:11
And what we want to do is solve this equation for w, meaning we want to isolate w on one side of our equation.
00:18
So in order to do that, we have to move everything else to the left -hand side.
00:22
Well, right now, we're taking this term 2l and we're adding it to 2w.
00:27
So what's the opposite of adding it? well, that would be the subtracted.
00:30
So we're going to begin by subtracting 2l from both sides of our equation, because 2l minus 2l is equal to 0.
00:37
So these terms will cancel.
00:39
And on the left -hand side, p and 2l are not like terms, so we'll leave them separate...