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The Straight Lines — Maths STD 11 Science — Question

CBSE BoardEnglish MediumSTD 11 ScienceMathsThe Straight Lines1 Mark
Question
State whether the two lines in the following are parallel, perpendicular or neither.
Through $(9, 5)$ and $(-1, 1)$; through $(3, -5)$ and $(8, -3)$
✓

Answer

Slope of line joining $(-1, 1)$ and $(9, 5)$
$\text{m}_1=\frac{5-1}{9-(-1)}=\frac{4}{10}=\frac{2}{5}$
Slope of line joining $(3, -5)$ and $(9, 5)$
$\text{m}_2=\frac{-3-(-5)}{8-3}=\frac{-3+5}{5}=\frac{2}{5}$
Here $m_1 = m_2$
$\therefore$ The two lines are parallel.

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