Solve the formula Ax + By = C for A

A =   (C - By)/x

Step-by-step explanation:

Ax + By = C

Subtract By from each side

Ax + By -By= C-By

Ax = C-By

Divide each side by x

Ax/x = (C - By)/x

A =   (C - By)/x

y = - 6

step-by-step explanation:

given the point (- 2, y) lies on the graph then it is a solution of it's equation.

substitute x = - 2 into the equation for value of y

y = 3(- 2) = 3 × - 2 = - 6

the point on the graph is (- 2, 6)

-2 is the right