Given two points, A(x1,y1), B(x2,y2), find the slope of the line that connects them:
(y2−y1)
(x2−x1)

A linear equation is written as y=mx+b

Given two points, A(x1,y1), B(x2,y2), find the midpoint of the line that connects them:
(
(x1+x2)
2
,
(y1+y2)
2
)

√(x2−x1)2+(y2−y1)2