Question

Find the equation of the line that is perpendicular to x+2y=-9 and that passes through (-3,-4). Express your answer in standard form.
What is the standard form of the equation of the line that satisfies the given properties?

Answer 1

able to get anywhere?

Answer 2

I'm pretty lost
I just changed numbers

Answer 3

First you need to solve x+2y=-9 for y

Answer 4

x+2y=-9

2y=-9-x

2y = -x - 9

y = -1/2x - 9/2

The slope of that line is ???

Answer 5

2

Answer 6

no

Answer 7

y = -1/2x - 9/2 is in the form y = mx+b

where

m = -1/2
b = -9/2

Answer 8

its a perpendicular line so my lecture said I have to flip the -1/2

Answer 9

oh i see what you are saying (I was asking about the initial line)

Answer 10

yes, the perpendicular slope is 2/1 or 2

Answer 11

y = mx + b

y = 2x + b .... plug in that perpendicular slope

-4 = 2(-3) + b ... plug in (x,y) = (-3,-4)

now solve for b

Answer 12

What do you get when you do so?