I also need help with this one too

Question

Use  for your variable.The difference of three times a number and the number is nine.

Answer 1

Thanks for asking a good question Mahiah!

Let "the number" be equal to x. Therefore, using this logic, we can say "three times of a number" must be 3x.

Difference means subtraction, so 3x - x would be on the left side of the equation. "Is" means "=", so...

3x - x = 9 ⇒ 2x = 9 ⇒ x = 4.5

Therefore, "The number", or x, is 4.5. In addition, "Three times of a number", or 3x, is 13.5

Hope this helps! Let me know if you need additional clarification!