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

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

anonymous · Answer

@primeralph

anonymous · Answer

well what is the slope of the line given?

anonymous · Answer

is it A ? - 7/4

anonymous · Answer

no, it's not A

nurali · Answer

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

anonymous · Answer

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

anonymous · Answer

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

anonymous · Answer

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

anonymous · Answer

i would have thought the slope was 7