Given the replacement set {0,1,2,3,4}, solve 6x-9=15

You can solve this two ways:

One is by substituting in the numbers until you get 15=15.

6 (0) - 9=15

0-9=15

-9=15

6 (1) - 9=15

6-9=15

-3=15

6 (2) - 9=15

12-9=15

3=15

6 (3) - 9=15

18-9=15

9=15

6 (4) - 9=15

24-9=15

15=15

Solution is x=4

or you can find the value of x

by first adding 9 to both sides to get x by itself

6x-9=15

6x=24

Then divide by 6

x=4