# Parallel and perpendicular lines in linear functions

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##### Intros

##### Examples

###### Lessons

- Determine whether the three points A (-2,-1), B(0,4) & C(2,9) all lie on the same line.
- Determine the following slopes are parallel, perpendicular, or neither.

i) $m_1 = {2 \over 5}, m_2= {2 \over 5}$

ii) $m_1 = {1 \over5} , m_2 = - {5 \over 1}$

iii) $m_1 = {4 \over 7}, m_2 = {12 \over 21}$

iv) $m_1 =$undefined, $m_2 = 0$

v) $m_1 =mn^{-1}; m_2 =-m^{-1}b$ - Given the points of two lines, determine when the lines are parallel, perpendicular or neither.
- Show that the points A(-3,0), B(1,2) and C(3,-2) are the vertices of a right triangle.
- Show that the points A(-1,-1), B(3,0), C(2,4) and D(-2,3) are the vertices of a square.