day:2

objective for day:2- students will be able to write linear equations of a line using data from a line of best fit.

The equation of a line is typically written as y=mx+b where m is the slope and b is the y-intercept.
,to find an equation you may use the formula- 

change in y   =   yA - yB change in x xA - xB

which will give you your data to write your equation

Example: Slope m  = change in y change in x   = 4-3 6-2   =1/4 y - 3 = (1/4)(x - 2) That is an acceptable answer, but we could simplify it further: y - 3 = x/4 - 2/4 y = x/4 - ½ + 3 y = x/4 + 5/2 other examples: http://www.youtube.com/watch?v=DodGaoJi25E solve-Write the standard form of the equation of the line through the given point with the given slope. 9) through: (1, 2), slope = 7 10) through: (3, −1), slope = −1 11) through: (−2, 5), slope = −4 12) through: (3, 5), slope = 5 3 -1- answer key-Write the standard form of the equation of the line through the given point with the given slope. 9) through: (1, 2), slope = 7 7 x − y = 5 10) through: (3, −1), slope = −1 x + y = 2 11) through: (−2, 5), slope = −4 4 x + y = −3 12) through: (3, 5), slope = 5 3 5 x − 3 y = 0 -1-