X-12÷6=9 what does it mean i don't under stand pleas do work

Mackenzie needs to determine whether the rectangles are proportional. which process could she use? check all that apply.

The domain of a function can be represented by which one of the following options? o a. a set of output values o b. a set of f(x) values o c. a set of input values o d. a set of both input and output values

Will mark brainlist what is the slope of the line passing through the points (-2, -8) and (-3,-9)? -7/5-5/71-1