From the equation 3y = 5 - x
how do you find the gradient? and what is it?
y = (5 - x)/3
gradient = -1/3
equation of a straight line: y = ax + b where a is a gradient.
If you are looking for the slant of the line perpendicular to this line, then it is negative one over slope of this line.
The slant of a line is the same anywhere on the line.
This is not true for a more complicated curve. So the slope of the perpendicular line to this one is
igloo myrtilles fourmis
ie. Sometimes its easier to understand when you see the formula
if the line gradient is ½ the the gradient of a perpendicular line will be -(1/(½) = -2
therefore in general the line with gradient m will have a pependicular line with gradient -1/m.
Last edited by rp_ (2006-02-16 10:42:29)