is x=-7 a solution of the equation -9=3x +9?

Question

thanks for helping me

Answer 1

Giovanni, plug in -7 for x and see if it makes our equation true.

 

-9 = 3(-7) + 9

-9 = -21 + 9

-9 = -12

 

Hey, not true, so x = -7 is not a solution.

Answer 2

I suggest you solve explicitly for x and see if it gives -7:

 

-9 = 3x + 9

 

-9 - 9 = 3x

 

-18 = 3x

 

x = -18/3 = -6

 

Therefore, x = - 7 IS NOT a solution of -9 = 3x + 9

 

 

 

Answer 3

No, x should not be -9. It should be -6. putting x as -6 will give you