Graphing Linear Equations to Find Solutions 
Slope-Intercept Form
Point-Slope Form
slope
y-intercept
y-y1=m(x-x1)
m = (y2-y1)/(x2-x1)
click to edit
(0,b)
x=0, y-intercept=b
Identical Lines
Infinite Solutions
Same Slope, Same y-intercept
Choose any (x,y) along the line
Parallel Lines
Parallel lines never intersect
Same Slopes
No Solution
Intersection at (x,y)
This (x,y) makes all the equations true
(x,y) is the solution