Question

Given the following formula, solve for l.

Answer 1

Answer: Option C

l = (P - 2b)/2

Explanation:

From P = 2(l + b)

Divide both sides by 2;

P/2 = 2(l + b)/2

P/2 = l + b

l + b = P/2

Make l the subject of formula;

l = (P/2) - b

l = (P - 2b)/2

Answer 2

P=2(l + b)
P=2l + 2b
P-2b=2l
P-2b/2=l
C is your answer