1. How to Write Linear Equations

2. Just a preview of Slope-Intercept form…
y = mx + b
y: y-value of a point
m = slope
x = x-value of a point
b = y-intercept
I am showing you this because this is how your equations will look when you write them using given points in a table!!

3. Vocabulary preview… Slope (m): Y-intercept (b):
The steepness of a line
Y-intercept (b):
Where the line crosses the y-axis on the graph

4. How to write an equation from a table…
1. Look for the change in the y-values on the table. (the pattern)
2. Take this number and write it in front of the x in the y=mx+b.
3. Take an x-value from the table and plug it in, and multiply your two numbers.
4. Find out how much you have to add or subtract to reach the y-value matched to that x-value you used.
Look at the example on the next slide 

5. Example
Look at the pattern in the y’s. It is +3. Take this and start writing your equation.
Y = 3x
Now take a value and plug it in for x. Start with 0.
Y=3*0, which is just 0
Well, that equals zero, right?! So, if you look at the y-value that is matched with the x-value you just used it is 3, not 0! So what do you have to add or subtract to get from 0 to 3??
You have to add 3!! So your equation is now…
Y= 3x +3!! X Y 3 1 6 2 9 12