Question

A number is decreased by seven. Then, the new number is multiplied by 3 to get an answer of -9.

What is the original number?

-30
30
4
-4

Please show me how you got your answer, thanks x

Answer 1

C.) 4

Explanation:

Let's try all of the answer choices to see what we get.

-30 - 7 = -37

-37 × 3 = -111

Okay, so we can rule A out. Let's try the next one.

30 - 7 = 23

23 × 3 = 69

We can rule B out too. Let's move on.

4 - 7 = -3

-3 × 3 = -9

We worked it out and we got -9,, we're going to check the last one to be sure.

-4 - 7 = -11

-11 × 3 = -33

Now we are sure the answer is C.

Answer 2

C: 4

Explanation:

You call the number x. Then you do (x-7) * 3= -9.

3x-21=-9

3x=12

x=4