1. GRAPHING!

2. Consider the following
y=x
What happens to y as x increases?
by how much?

3. OK, consider this
y = 2x
What happens to y as x increases?
by how much?

4. How about this?
y = 5x
What happens to y as x increases?
by how much?

5. from back of the class
Marc: this is algebra, what does
this have to do with graphing??
Jerome: I don't know
Ken: I like cheese

6. Describe this line

7. Describe this line

8. Describe this line

9. Jerissa: where is he going
with this?
Tricia: huh?
Chastity: Khoa you stink!

10. lets go back and look at the equations
y=x
here are some values of y at different
values of x
x 1 2 3 0 -1 -2 -3
y 1 2 3 0 -1 -2 -3

11. lets go back and look at the equations
y = 2x
here are some values of y at different
values of x
x 1 2 3 0 -1 -2 -3
y 2 4 6 0 -2 -4 -6

12. lets go back and look at the equations
y = 5x
here are some values of y at different
values of x
x 1 2 3 0 -1 -2 -3
y 5 10 15 0 -5 -10 -15

13. Cedric: I think I see where he is
going here, I think I could graph
those values!
Phong: ZZZZZZZZZ

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

15. y = 2x
x 1 2 3 0 -1 -2 -3
y 2 4 6 0 -2 -4 -6

16. y = 5x
x 1 2 3 0 -1 -2 -3
y 5 10 30 0 -5 -10 -30

17. y= x
So what happens to the line when this
number gets bigger?
What happens when it gets smaller?

18. Let's use a letter to represent this value.
Let's us m.
y = mx
Let's give m a name, we can call it SLOPE

19. What happens to a line as m gets
smaller?
What if it was so small it was
negative?!

20. Graph y = -1x