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Deepak Bora
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Find the equation of a straight line passing through the intersection of 2x + 5y – 4 = 0 with x-axis and parallel to the line 3x – 7y + 8 = 0.

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This is the Important question of class 10 Based on Equation of a Straight Line Chapter of M.L Aggarwal book for ICSE BOARD.
Here a straight line passing through a intersection with x-axis and parallel to a line
Find the equation.
This is the Question Number 21, Exercise 12.2 of M.L Aggarwal.

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1 Answer

  1. Let’s assume the point of intersection of the line 2x + 5y – 4 = 0 and x-axis be (x, 0)

    Now, substituting the value y = 0 in the line equation, we have

    2x + 5(0) – 4 = 0

    2x – 4 = 0

    x = 4/2 = 2

    Hence, the co-ordinates of the point of intersection is (2, 0)

    Also given, line equation: 3x – 7y + 8 = 0

    7y = 3x + 8

    y = (3/7) x + 8/7

    So, the slope (m) = 3/7

    We know that the slope of any line parallel to the given line will be the same.

    So, the equation of the line having slope 3/7 and passing through the point (2, 0) will be

    y – 0 = (3/7) (x – 2)

    7y = 3x – 6

    3x – 7y – 6 = 0

    Thus, the required line equation is 3x – 7y – 6 = 0.

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