Question

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

2

Explanation:

The parallel line will have the same coefficients, but a constant suited to the given point:

x + 3y = constant

That is, A=1, B=3, so B-A = 2.

___

The constant for the parallel line will be -1.