Warm up 11

• 1.) Graph using 3 points x +3y =6

• 2.) Graph using intercepts 3x-2=y

• 2.) Graph a.) x=-3

b.) y=-2

7.4 Slope

Slope Dude

• http://www.youtube.com/watch?v=avS6C6_kvXM

5

4

3

2

1

-1

-2

-3

-4

-5

-6 -4 -2 2 4 6

“slope”

x"" in change

y"" in changeslope

2

3 run

rise

5

4

3

2

1

-1

-2

-3

-4

-5

-6 -4 -2 2 4 6

Graph the line containing the points (-4,2) and (2,-3) and find the slope.

x"" in change

y"" in changeslope

5

6

1 2

1 2

("m")y y

slopex x

Find the slope of the line containing (1,1) and (3,5)

31

51

m 22

4

Find the slope of the line containing (2,2) and (8,9)

1 2

1 2

("m")y y

slopex x

2-9 = -7 = 72-8 -6 6

Find the slope of the line containing (-4,-6) and (3,-2)

1 2

1 2

("m")y y

slopex x

M= -6 - -2 = -6 +2 = -4 = 4 -4 – 3 -4-3 -7 7

Find the slope of the line containing (-2,3) and (2,1)

2

1

4

2

)2(2

13

m

4

3

2

1

-1

-4 -2 2 4 6

47

= 0.57Slope CB = -0.50

B

C

What is the slope?

(5,4)(-6,4)

Horizontal line = “0” slope

What is the slope?(3,8)

(3,-2)

Vertical line = “no slope”

A line contains points (5, 3) and (x, 9) and has slope = 3. Find the value of x.

3 15 6x

3 21x 7x

3= 3-9 5-x

3 = 6 5-x

A line contains points (3, 2) and (7, k) and has slope = 5. Find the value of k.

22 k

You try this one and raise you hand when you are done

A line contains points (9, -5) and (-8, k) and has slope = 0. Find the value of k.

5 k

Assignment

Page 321

4-30 even