A−7=3(b+2) whrite formula for g(b) in terms of b

We'll assume that a is the dependent variable, dependent on b,

and that b is the independent variable.

Solving for a, add 7 to both sides:

a = g(b) = 7 + 3(b+2), or

     g(b) = 7 + 3b + 6, or

     g(b) = 3b + 13

what are you trying find out?

step-by-step explanation:

cross multiplying, we get :

⇒ (3) × (5) = (9) × (x)

⇒ 15 = 9x