Question

what is the answer to 9=4a+13

Answer 1

9 = 4a + 13
-4a = -9 + 13
4a = -4
a = 4 : -4
a = -1

Answer 2

9 = 4a + 13

Minus 13 to the other side,

-4 = 4a

Divide 4 on both sides to get a by itself,

-1 = a
a = -1

Hope this helped!