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Easy

Question

A line make zero intercepts on x – axis and y – axis and it is perpendicular to the line 3x +4y+ 6 = 0 then its equation is

  1. y = x
  2. 4x – 3y = 0
  3. 4x – 3y + 8 = 0
  4. 4x – 3y + 6 = 0

hintHint:

Assume the equation of line is y equals m x plus c . It is given that y- intercept is zero so c equals 0. When two lines are perpendicular the product of their slopes is negative 1

The correct answer is: 4x – 3y = 0


    Let the equation of the line is y equals m x plus c
    Step1: Line making zero intercept on the x and y axis.
    Since the line is making is making zero intercept with y- axis then c equals 0
    Step2: Line perpendicular to 3 x space plus 4 y plus space 6 space equals space 0.
    When two lines are perpendicular the product of their slopes is equal to negative 1.
    The slope of a line a x plus b y plus c equals 0 is given by fraction numerator negative b over denominator a end fraction. Therefore the slope of the given line is fraction numerator negative 4 over denominator 3 end fraction
    Slope of line to find is m.
    Then according to the property of perpendicular lines
    m cross times open parentheses fraction numerator negative 4 over denominator 3 end fraction close parentheses space equals space minus 1
    =>m space equals space 3 over 4
    Therefore the equation of the line will be y equals space m x plus c space where c equals 0 and m equals 3 over 4
    =>y equals 4 over 3 x or 4 x minus 3 y equals 0

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