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

Answer 1

when 2 lines r perpendicular to each other...
if the slope of one line is "m" then the slope of the other should be "(-1/m)"

Answer 2

in the standard form
y = mx + c
m is the slope...

so u have to convert ur answers to standard form and c whether the which pair satisfy the above conditions

Answer 3

I will show u how to do it for the first answer.. u may follow it to the other ones...
Lets consider the 1ST choice
2x - 8y = 9
convert it to the standard form
8y = 2x - 9
y = (2/8)x - 9/8
so the slope of this line is
2/8
the if there is an line perpendicular to this one the slope of that line should be (-8/2) which is(-4)
now lets consider the other line
12x - 3y = 7
3y = 12x - 7
y = 4x = 7/4
here the slope is 4 but it should be (-4).. so it;s not this one....

now u have to do the same steps and check the other answers..

can u do that ... i wll help u ??