Question

please help.
What is the slope of a line perpendicular to the line 12x - 4y = 7?
A. -7/4
B. 7/4
C. -1/3
D. 1/3

Answer 1

@primeralph

Answer 2

well what is the slope of the line given?

Answer 3

is it A ? - 7/4

Answer 4

no, it's not A

Answer 5

To find the slpoe of a line we use the following formula:
Slope of the line= -x/y
Now come to the question
Given line is 12x - 4y = 7
Let "m" be the slope of the given line, then
m = -12 / -4
m = 3
Now there is another line which is perpendicular to the given line, so let m' be the slope of the perpendicular line.
By defination,
m x m' = -1
3 x m' = -1
m' = -1 / 3

Answer 6

would have never expected it to be -1/3 ... but thanks.

Answer 7

well if you know that the slope of the given line is 3... then -1/3 would seem pretty expected right?

Answer 8

how am i suppose to know tje slope of the line?

Answer 9

i would have thought the slope was 7