- anonymous

write an equation in the form y =mx+b for the line that passes through the point (-5,-1) and has a slope of -2

- chestercat

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- tkhunny

Well, do it. You have "y = mx + b" and you are give the slope. Simply substitute that.
y = -2x + b
Now what? That point was given for a reason.

- anonymous

do i subtract -2 from -1

- tkhunny

Why would you do that? Use the given point. (x,y) = (-5,-1)

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## More answers

- anonymous

i dont understand

- tkhunny

What does (-5,-1) mean when it indicates a point on a line?

- pooja195

Before any of the we need to do the point slope formula
\[\huge~y-y_1=m(x-x_1)\]
m=slope
(x1,y1)

- anonymous

y--2=m(x-x1)

- pooja195

We also have the slope :) m=-2
try again

- tkhunny

Yes, we can use the point-slope formula, but then you have to remember that. I prefer simply thinking. Please answer my question.
What does (-5,-1) mean when it indicates a point on a line?

- anonymous

y--1=m(x-x1

- pooja195

Still wrong. Let me help you out :)
-5 = x1
-1 = y1
-2=m

- pooja195

Knowing that can you plug in the numbers?

- pooja195

Stuck?

- tkhunny

|dw:1434125042262:dw|
"plug in numbers" doesn't mean anything.
The idea of "substitution" is universal and should be burned into your brain.

- anonymous

yes i am

- pooja195

@tkhunny im sorry that my learning and teaching style is nothing like yours.

- pooja195

y+1=-2(x+5)
start by distributing
\[\huge~-2(x+5) \]
do you know how to do that part atleast?

- anonymous

-10

- pooja195

ok
-2 * x = ?

- tkhunny

@pooja195 No worries. We're all in this together. That's why I say, "I prefer this way." rather than "This is the way to do it or you are an idiot!" :-) Unique answers don't actually care how you find them. I am delighted there are different ways to go about it.

- pooja195

:)

- pooja195

\[\huge~y+1=-2x-10\]
-10 + 1 =?

- anonymous

-9 and i like poojas more better understand a little

- pooja195

good so we have our answer :)
y=-2x-9 :)
and thanks

- pooja195

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- anonymous

thank u

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