Question

Suppose you're given the formula P = 9m – 3n. If you know that n is 1⁄3 of m, how could you rewrite this formula?

Answer 1

Answer:

Option C - $P=8m$

Step-by-step explanation:

Given : Formula $P=9m-3n$ If you know that n is $\frac{1}{3}$ of m.

To find : How could you rewrite this formula?

Solution :  

Step 1 - Write the formula,

$P=9m-3n$

Step 2 - Substitute, $n=\frac{1}{3}m$

$P=9m-3(\frac{1}{3}m)$

Step 3 - Solve,

$P=9m-m$

$P=8m$

Therefore, The formula can be re-write as $P=8m$

So, Option C is correct.

Answer 2

Answer:

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).

Step-by-step explanation: