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28. Straight Line in Space
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Q16 of 136 Page 29

Find the Cartesian and vector equations of a line which passes through the point (1, 2, 3) and is parallel to the line .

Firstly, we need to write the cartesian form of the given line i.e. of

Cartesian equation is



So the direction ratios of the given line are ‹–1, 7, 3/2›


Vector Equation of line passing through the point (1, 2, 3) i.e. position vector and having direction ratios ‹–1, 7, 3/2› is



And the cartesian equation is



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Show that the points whose position vectors are and are collinear.

17

The Cartesian equations of a line are 3x + 1 = 6y – 2 = 1 – z. Find the fixed point through which it passes, its direction ratios and also its vector equation.

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Find the vector equation of the line passing through the point A(1, 2, –1) and parallel to the line 5x – 25 = 14 – 7y = 35z.

Questions · 136
28. Straight Line in Space
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