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During oct.6 we are talking about *Formulas for lines: *

here is the y=m*x*=b slope-int. formula which is use when we know the slope and the y-int.

note that m=slope b=y-int

we use y-y1=m(x-x1) is called the point-slope form, we use this when we know the slope and a point

Note that the one beside the y and x mean that the first y-int point and first x-int point

Here is the general form ax=by=c=0 "write this down in your dictionary"

sometimes written as ax=by-c=0

useful for graphing lines when a and b are factors of c. we can easily find the int.

EX: 2*x*-3*y*=6 Ex: x-int., let y=0

find y-int. let *x*=0 2*x*-3(0)=6

2(0)-3*y=6 x=3*

*y=-2*

## 1 Comments:

It's ok! :)

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