SOLUTION: Which of the following is the equation of a line that passes through (-2, -1) and (-4, -3)? A step-by-step solved answer would be very helpful, as well as side notes as to wha

Question 526995: Which of the following is the equation of a line that passes through (-2, -1) and (-4, -3)?

A step-by-step solved answer would be very helpful, as well as side notes as to what is happening in each step. Thank you!
-Laura DiPietro
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!

First let's find the slope of the line through the points

and

Note:

is the first point

. So this means that and .
Also,

is the second point

. So this means that and .

Start with the slope formula.

Plug in , , , and

Subtract from to get

Subtract from to get

Reduce

So the slope of the line that goes through the points

and

is

Now let's use the point slope formula:

Start with the point slope formula

Plug in , , and

Rewrite as

Rewrite as

Distribute

Multiply

Subtract 1 from both sides.

Combine like terms.

Simplify

So the equation that goes through the points

and

is

If you need more help, email me at jim_thompson5910@hotmail.com

Also, please consider visiting my website: http://www.freewebs.com/jimthompson5910/home.html and making a donation. Thank you

Jim

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