BIM ALG 1 Ch 4.1 Equations of Lines

BIM ALG 1 Ch 4.1 Equations of Lines

Equation of Lines

y=mx+b

m=2

b=1

y=2x+1

b=y intercept y values!

Where line crosses y axis.

b=4

 $m=\frac{y2-y1}{x2-x1}$  
 $m=\frac{0-4}{5-0}=\frac{-4}{5}$  

y=mx+b

 $y=-\frac{4}{5}x+4$   

 $m=\frac{y2-y1}{x2-x1}$  

Two points on a graph.

 $m=\frac{2-8}{3-7}=\frac{6}{-4}$  
 $m=-\frac{3}{2}$  

If I continue line down, it crosses y axis at (0, -5/2).   b=-5/2

Line is  $y=-\frac{3}{2}x-\frac{5}{2}$   

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HW:

P179 3-33 every 3rd