Question

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

Answer 1

$3a+b=54\\\\ Substitute\ b\ =\ 9\ into\ the\ equation.\\\\3a+(9)=54\\\\Subtract\ 9\ on\ both\ sides.\\\\3a=45\\\\Divide\ by\ 3\ on\ both\ sides.\\\\{\boxed{a=15}$

Answer 2

If you would like to solve the equation 3 * a + b = 54, when b = 9, you can calculate this using the following steps:

b = 9
3 * a + b = 54
3 * a + 9 = 54
3 * a = 54 - 9
3 * a = 45     /3
a = 45/3
a = 15

The correct result would be 15.