Question

Determine the value of A so that the line whose equation is Ax+y-5=0 is perpendicular to the line containing the points (1,-4) and(-5,4).
A=?

Answer 1

slope of perpendicular line
m=(4-(-4))/(-5-1)=8/-6=-4/3

Answer 2

so slope of other line must be =-1/(-4/3)=3/4
property of perpendicular lines

Answer 3

ax+y-5=0

comverting in standard form
y=m1*x+c
y-5=-ax
y=-ax+5
on comparing
m1=-a
-a=3/4
a=-3/4

Answer 4

@gorv how did you get y-5=-ax from y=ml*x+c?

Answer 5

@gorv nvm i got it but our teacher never taught us those formulas : y=ml*x+c or ml=-a

Answer 6

I see why thats the answer though... still frustrating because I would of been driving in circles if I hadn't known the formula y=ml*x+c

Answer 7

you heard of
y=mx+c

Answer 8

??

Answer 9

reply plzzz

Answer 10

as i m getting no rply ..so i m leaving it here ,,,