Select the pair of equations whose graphs are perpendicular.

A.
2x – 8y = 9
12x – 3y = 7

B.
3x + 6y = 8
y = 2x – 8

C.
y = 2x – 7
x + y = 3

D.
2y = –3x + 5
2x + 3y = 4

is there any other way to solve this other than graphing?

Question

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

is there any other way to solve this other than graphing?

anonymous · Answer

work out the slope of each equation. Perpendicular lines have opposite reciprocal slopes, i.e. $m_1=-\frac{1}{m_2}$

anonymous · Answer

OMG THANKS SO MUCH!! ahha I needed to know what the relationship between each slope was for what kind. and for future stuff, what about parralel? what will the slopes be like then?

anonymous · Answer

Parallel lines have the same slope.