What is the slope of a line that is perpendicular to the line whose equation is ax+by=c?

A) a/b B) b/a C) -b/a D) c/b

Question

What is the slope of a line that is perpendicular to the line whose equation is ax+by=c? 

A) a/b       B) b/a        C) -b/a          D) c/b

anonymous · Answer

condition of two line is perpendicular is multiplication of their slopes is=-1.

nincompoop · Answer

perpendicular to the slope 
so two slopes must be the negative reciprocal of each other

an example would be
3/4  and -4/3 

or 
-2 = 1/2

anonymous · Answer

So, A?

anonymous · Answer

are you know the slope of given line?

anonymous · Answer

I don't know whether it's A or B

nincompoop · Answer

ax+by=c 
in slope-intercept form it will be
y = (-ax+c)/b

we the have -a/b  so its negative reciprocal
- (b/-a) = b/a

anonymous · Answer

Thx

nincompoop · Answer

@hartnn @ganeshie8 
please check my response if logically valid.

hartnn · Answer

yes, thats correct :)

nincompoop · Answer

thank you