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.
You can use this fancy website called desmos to graph things.
If it is parallel to x+3y=-5 then it should have the same slope: x+3y, just change the x intercept.
x+3y is equivalent to y=-1/3x
So we graph -7, 2 then we move down using y=-1/3x.
If you do that you'll see that the equation you get is x+3y=-1