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Question
Answer the following question:
Find the equation of the line through the origin which bisects the portion of the line 3x + 2y = 2 intercepted between the co−ordinate axes.
Solution
Given equation of the line is 3x + 2y = 2.
∴ `(3x)/2 + (2y)/2` = 1
∴ `x/(2/3) + y/1` = 1
This equation is of the form `x/"a" + y/"b"` = 1, with a = `2/3`, b = 1.
∴ The line 3x + 2y = 2 intersects the X-axis at A `(2/3, 0)` and Y-axis at B(0, 1).
The required line is passing through the midpoint of AB.
∴ Midpoint of AB = `((2/3 + 0)/2, (0 + 1)/2) = (1/3, 1/2)`
∴ Required line passes through (0, 0) and `(1/3, 1/2)`.
Equation of the line in two point form is
`(y - y_1)/(y_2 - y_1) = (x - x_1)/(x_2 - x_1)`
∴ The equation of the required line is
`(y - 0)/(1/2 - 0) = (x - 0)/(1/3 - 0)`
∴ 2y = 3x
∴ 3x – 2y = 0
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