Posted by Nate on .
how to I find an equation of a line given two points on that line (not using a graph) example:(1,5)(2,7)

Algebra 
drwls,
Use the standard linear equation form
y = mx + b.
The slope is m = (75)/(21) = 2
Choose b so that y = 2x + b goes through either point.
7 = 2*2 + b
Solve for b and then write the standard equation with numbers substituted for m and b