Day 5: Writing equations a line given data points.

	-Where you mark a point on a graph by how far along and how far up it is.
Example: The point (12,5) is 12 units along, and 5 units up. The formula is: Slope m  =   change in y   =   yA - yB change in x xA - xB Quiz:

1 ) Find the equation of the line given the two points (5, 7) and (8, 13).

 a) y = 2x – 3
 b) y = 2x + 1
 c) y = 3x – 5
 d) y = 2x + 6

2) Find the equation of the line given the two points (5, 0) and (–3, 8).

 a) y = x – 2
 b) y = –x + 5
 c) y = –2x – 2
 d) y = –2x + 1

3) Find the equation of the line given the two points (7, 45) and (4, 21).

 a) y = 6x + 10
 b) y = 8x – 11
 c) y = 5x – 5
 d) y = 9x + 2