Question

What is the value of a in the equation 3a + b = 54, when b = 9?

Answer 1

A=15 because if you subtract 9 from both 9 and 54, you are left with 3a=45. 45 divided by 3 is 15, making a=15

Answer 2

3a + b = 54
3a + (9)=54
3a + 9 = 54
You plug in b^
Then, subtract 9...
3a +9 -9 = 54 - 9
3a = 45
Divide by 3
3a/3 = a
45/3 = 15
a = 15