+0  
 
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avatar+2291 

Please help, thanks!

RainbowPanda  Nov 27, 2018
 #1
avatar+92641 
+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 ]

 

 

 

 

 

cool cool cool

CPhill  Nov 27, 2018
 #2
avatar+2291 
+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
 #3
avatar+2291 
+1

Is it this?

5) -1/5/3=-0.6=-3/5??

6)-1/1/4=-0.25=-1/4

RainbowPanda  Nov 27, 2018
 #4
avatar+92641 
+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.....!!!

 

 

cool cool cool

CPhill  Nov 27, 2018

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