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January 28, 2015

January 28, 2015

Posted by **Johnnie** on Thursday, March 19, 2009 at 7:39pm.

help me with this.

- alegbra -
**Damon**, Thursday, March 19, 2009 at 7:42pmWe need to find the slope of the original line

One way is to put it in the form y = m x + b

2 y = -9 x + 3

y = -9/2 x + 3/2

so the slope m = -9/2

now the slope of the perpendicular m' = -1/m

= 2/9

so our line has the form

y = -2 x/9 + b

now put 4 in for x and -2 in for y and find b

- alegbra -
**Reiny**, Thursday, March 19, 2009 at 7:44pmeasy way:

A line perpendicular to 9x + 2y = 3 must be

2x - 9y = k

sub in your given point to find k,

all done!

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