Question
State whether the two lines in the following are parallel, perpendicular or neither. Through (5, 6) and (2, 3); through (9, -2) and (6, -5)

Answer

Slope of line joining (5, 6) and (2, 3) $\text{m}_1=\frac{\text{y}_2-\text{y}_1}{\text{x}_2-\text{x}_1}=\frac{3-6}{2-5}=\frac{-3}{-3}=1$ Slope of line joining (9, -2) and (6, -5) $\text{m}_2=\frac{\text{y}_2-\text{y}_1}{\text{x}_2-\text{x}_1}=\frac{-5-(-2)}{6-9}=\frac{-5+2}{-3}=1$ Here $m_1 = m_2 \therefore$ The two lines are parallel.

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