Suppose you're given the formula n = 3m – 2l. If you know that l = m + 2, how could you rewrite the

Question

Suppose you're given the formula n = 3m – 2l. If you know that l = m + 2, how could you rewrite the formula?

A. n = m – 4

B. n = 2m + 2

C. n = 2m – 4

D. n = m + 2

Answer 1

This problem is very easy. Start with the formula given, i.e.,  n=3m-2l. Now, use the fact that you are told that l = m+2 and rewrite your original formula as

n = 3m -2(m+2).

Simple algebraic manipulations give  n = 3m-2m - 4 = m-4.  So the answer is (A).