Find the value of B - A if the graph of Ax + By = 3 passes through the point (-7,2), and is parallel to the graph of x + 3y = -5.

Answer 1

"is parallel to the graph of x + 3y = -5"
so, in Ax + By = 3, the values are A = 1 and B = 3
So B - A = 3 - 1 = 2

The fact that it passes through (-7,2) is irrelevant