Parallel Lines & Perpendicular Lines
Parallel Lines
Perpendicular Lines
Definition
2 lines that will never meet each other.
If two straight lines will never meet each other, they are considered as "parallel".
Definition
Two lines that cross each other.
The angle created will always be 90˚ in the angle.
Example
Example
Equation & Tips
For 2 lines to be parallel, the 2 lines have to have the same slope.
The 2 lines cannot share the same X coordinates.
There has to be 2 lines
Equation & Tips
For a line to be perpendicular to the other, the line has to be the -1/m of the other line.
For example, if line A has a slope of 3, for line B to be perpendicular to line A line B has to be -1/m meaning the slope for line B has to be -1/3
Line A: 2x
Line B: -1/2 x
Line A: 2x + 1
Line B: 2x