Summary: Linear Equations

Linear Equations                                                                 October 13, 2011

OBJECTIVE: SWBAT WRITE, GRAPH, AND CREATE LINEAR EQUATIONS IN THE THREE FORMS

Basically all we did was review slope intercept (SI), point slope (PS), and standard form (STD). Along with that, we practiced changing from one form to another. For example, we did a problem for PS then changed it to SI then changed it to STD. Now, changing from PS to SI is quite easy actually but, changing from SI to STD. Now, that is a whole another story because I get it but, then I don’t get it. It looks hardier than it actually is but, I think I can manage to it.

EXAMPLE:

(3, 4) b=-5

1. Point Slope (PS)-

*To find your slope do y1-y2 over x1-x2, when you have two points*

-5-4/0-3 equals -9/-3 which equals positive 3

Now just substitute the numbers into the formula-

y-4=3(x-3)

2. Slope Intercept (SI)-

*Substitute in the numbers for slope and y-intercept*

y=3x-5

3. Standard Form (STD)-

*If your slope is positive the y will be negative*

**If your y is negative then C might be positive**

3x 1y=

Now, just figure out the sign and if the C is negative or positive

3x-1y=5 or 3x-y=5

   -y is negative because it will then make -3x positive and make 5 negative