Seven times the sum of a number and nine is 7

Question

I need help with this I know it's easy but I'm drawing a blank here 

Answer 1

Hi Jess;

7(x+9)=7

Let's divide both sides by 7...

[7(x+9)]/7=7/7

x+9=1

Let's subtract 9 from both sides...

x+9-9=1-9

x=-8

Let's check our work...

7(x+9)=7

7(-8+9)=7

(7)(1)=7

7=7

Answer 2

Hello, thank you for taking the time to post your question!

The key on this type of question is to use the information given in order to set up an expression that models that situation. Here we have

7(x + 9) = 7  because it says that seven times the sum of a number and nine is 7

From there then you can solve for the value of “x” algebraically! When I do that I get

x + 9 = 1

x = -8

so the underlying number that it’s after here is -8

I hope that helps you get moving in a better direction on this type of question! Feel free to reach out if you have any additional questions beyond that :)