Section: Math

84) If a+3b=37 and a-3b=19, then b=?

Explanation

Answer 1 is correct. Using system of equations, add the two givens like such:

a+3b=37
a-3b=19
2a=56
a=28

Now plug in 28 and isolate b.

28+3b=37
3b=9
b=3

AND

28-3b=19
-3b=-9
b=3