C

H

B

G

A

FE

D

Match each graph with its equation. Write down the strategy you used for each.

x = -3y = -2x - 1

y = 6x = 7/2

2x + 3y = 12

-8x + 10y = 40

y = 2x + 1y = -2

1

4

5

7

8

6

3

2

Answers:

1 =5 =2 =6 =3 =7 =4 =8 =

Agenda Thursday, Dec. 2

Homework Check

Quiz Or Review

Write an equation of a line that has the same slope as 4x – 10y = 10 and the same y-intercept as 2y + 2 = 12x.

y = 2/5 x - 1

Write an equation of a line that has the same slope as 2x + 5y = -10 and the same y-intercept as 4y + 11 = 6x.

y = -2/5 x - 11/4

Find the slope:

(0, 3) (0 , 8)undefined

(4, 10) (2, -5)15/2

(6, -10) (-4, 2)-6/5

(7, 3) (8, 3) 0

(-7, -5) (-8, -3)

-2

Find the slope between these two points. slope = y2 - y1

x2 - x1

1 2 31. y = 2/3x + 1 3. y = -3/4x + 22. y = 1/2x - 3

GRAPH

Graph

-8x + 2y = - 163x - 3y = 9

Ax + By = C

To put into standard form, just use rules for solving equations.

y = 3 x + 2 4

Try these:

y = 2x - 1 -2x + y = -1 or

2x + y = 1

y = 1/2 x - 3/2 x - 2y = -3 or

-x + 2y = 3y = 3/7 x - 3/8 -24x + y = -21 or

24x - y = 21

WHITEBOARD PRACTICE

What are the x and y-intercepts?

3x + 9y = 18 (6, 0) (0, 2)

5x - y = 100 (20, 0) (0, -100)

-8x - 3y = -48 (6, 0) (0, 16)What is the equation of each line?

x = - 6 y = - 7 x = 5.5