Lines within a Coordinate Plane

In a coordinate plane, there perpendicular lines. A perpendicular line is when one line makes a 90 degree angle with with another line.

A coordinate plane consists of four quadrants, a x-axis, a y-axis, and the origin (0,0) as shown in the picture below.

When given a pair of coordinate points, it will be set up a (x,y), (x,y). In order to graph these points to create a line, an equation must be used.

• Slope-intercept form: y=mx+b
• Point-slope form: y-y1= m(x-x1)

Either equation will work fine when the slope and a pair of coordinate points are found. First, once two pairs of points are present, the slope can be found with the slope formula.

• Slope formula: m=y2-y1
•                                                                         x2-x1

Once the slope is found, a line can now be drawn when everything is put into one pf the top two equations.