#1**+2 **

Very similar to the last one, RP

Get to the form (like we did in the other question )

y = mx + b the slope is m

A perpendicular line will have the slope = -1/m

Example :

4) y = -2x + 4 the slope is -2 = m

The slope of a perpendicular line is -1/m = -1 / (-2) = 1/2

So perpendicular line : y = (1/2)x

(As a tip....when we have a whole number slope, m....write it as m/1....then "flip it" and make it negative to find the slope of the perpendicular line....so ..... -2 = -2/1 = - (1/-2) = 1/2....

When we have a fractional slope....flip it and make it negative to find the slope of the perpendicular line ...so....2/3 = -3/2 )

Can you try the other two, RP??? [ I'll check your answers....if you want ]

CPhill
Nov 27, 2018

#2**+1 **

I dont really get this one though..I have the slopes

5) y=5/3x-1/3

m=5/3

6) y=1/4x+1/4

m=1/4

RainbowPanda
Nov 27, 2018

#4**+2 **

OK....you have the correct slope for (5) = 5/3

So...a perpendicular line will have the slope = -3/5

And an equation for a perpendicular line : y = (-3/5)x

For (6)

4y - 1 = - 1x add 1 to both sides

4y = -1x + 1 divide both sides by 4

y = (-1/4)x + 1/4 the slope is (-1/4)

A perpendicular line has the slope = 4/1 = 4

( "Flip" -1/4 = -4/1 .. take the negative of this = - (- 4/1) = 4/1 = 4 )

So....the equation for a perpendicular line is : y = 4x

Hope that makes some sense.....!!!

CPhill
Nov 27, 2018