What is the graphing of the equation 4x - 5y equals 15

There is a line with slope 1/a going through the point (a, a²). find the equation of the line perpendicular to this line at this point. (don’t let this problem intimidate you! solve the problem as you would if i’d given you specific values. just use variables instead.)

What is not true about kl and mn? what is mn? (show your work)

How do you determine if an ordered pair is a solution to a given equation?