Rewrite the formula to find w.

If P = 2l + 2w, the formula to find w is.

If P is 30 units and l is 10 units, w is units.

P = 2L + 2W

P - 2L = 2W

(P - 2L) : 2 = W

If P = 30 and L = 10, substitute

W = (30 - 2 (10)) : 2

W = (30-20) : 2

W = 10 : 2

W = 5

You want to solve this formula using the same rules as you would for an equation. Your goal is to isolate the variable in question, w. First, to isolate w, you must get the term 2w by itself on one side of the equation. Therefore, you need to remove the 2l from the right hand side of the equation by subtracting. Of course, since you subtracted it from the right hand so you must also subtract 2l from the left hand side. this will give you P-2l = 2w. Good so far, but your goal is to solve for w, not 2w. So now you must divide by 2 on both sides (be careful to divide all terms by 2). Once you do that you will be solved for w. Just flip the equation around so that w is on the left and you now have a formula for w in terms of P and l. Follow these steps and you will be able to get your solution by substituting 30 for P and 10 for l into your formula for w.