9 + x = 17

Question

I know that x=8 but how did you get it

Thanks

Answer 1

9 + x = 17

Subtract 9 from both sides of the equation.

9 - 9 + x = 17 - 9

x = 8

Remember -- you need to get the known quantities on one side and the unknown on the other side.

Answer 2

thanks so much!

Answer 3

You're very welcome.