. Solve for x and y: ax + by - a - b and bx - ay = a + b

it is contrapositive

i could not see the question too well so check yourself again too . this is because i want you to get it correct.

this equation is in point-slope form.

where,

using this equation you can gather a point and the slope, which gives you enough information to draw a line. transform the equation to standard form to start.

the equation is now in standard form, we have a point, as well as the slope:

point: (0, -6)

slope: -2

plot (0,-6), then simply rise/run with the provided slope of -2, once you feel you have a comfortable amount of points - draw a line.