Question

Select the pair of equations whose graphs are perpendicular. A. 3x + 6y = 8 y = 2x – 8 B. 2y = –3x + 5 2x + 3y = 4 C. 2x – 8y = 9 12x – 3y = 7 D. y = 2x – 7 x + y = 3

Answer 1

Have you ever considered graphing these? Lines that are perpindicular, by the way, aways have a slope that equals the negative reciprocal of the line that they are perpindicular to, so you can also algebraically see.

Answer 2

perpendicular lines have slopes that are negative reciprocals of one another.
I would manipulate the formulas above into slope-intercept form and compare the slopes.

Answer 3

perpendicular functions have slopes that are negative reciprocals of the original slope.

Answer 4

*the other slope, not original.