1. GRAPHING!
2

2. What would happen if there was
a number added to our line?
What would y = x + 1 look like?

3. y=x+1
x 1 2 3 0 -1 -2 -3
y

4. What if that number increased?
What would y = x + 4 look like?

5. y=x+4
x 1 2 3 0 -1 -2 -3
y

6. What happens to the line when that last
number increases?
Do you think that is always the case?
We should assign it a variable then, b

7. What happens when b is negative!?
What would y = x - 2 look like?

8. y=x-2
x 1 2 3 0 -1 -2 -3
y

9. So lines come in the form
y = mx + b
where m affects the slope of the line and b
changes where the line crosses the y
axis.....
where it intercepts the y axis....
so we call it .....
the y-intercept!