SOLUTION: Help with equations please? I need to find the equation of the lines joining the pairs of points: (2, 40) (4, 50) Any help appreciated! Thanks

Question 469294: Help with equations please?
I need to find the equation of the lines joining the pairs of points:
(2, 40)
(4, 50)
Any help appreciated!
Thanks
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

Distribute

Multiply

Add 40 to both sides.

Combine like terms.

So the equation that goes through the points

and

is

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