Solve for the following if x = 6: (Hint: substitute 6 for the letter x and work the problem. You will work more with substitution later.)
Example: 10x = 10*6 = 60
9. x - 1 ( if x = 3)
10. 12 + x ( if x = 3)
11. 5x - 7 ( if x = 3)
12. 33/x ( if x = 3)
13. 2 + 9x + 12 ( if x = 3)
