Q. 144.4( 68 Votes )
Find equation of the line through the point (0, 2) making an angle with the positive x-axis. Also, find the equation of line parallel to it and crossing the y-axis at a distance of 2 units below the origin.
Given point = (0, 2) and θ = 2π/3
We know that m = tanθ
∴ m = tan (2π/3) = -√3
We know that the point (x, y) lies on the line with slope m through the fixed point (x0, y0), if and only if, its coordinates satisfy the equation y – y0 = m (x – x0)
∴ y – 2 = -√3 (x – 0)
⇒ y – 2 = -√3 x
⇒ √3 x + y – 2 = 0
Given, equation of line parallel to above obtained equation crosses the y-axis at a distance of 2 units below the origin.
So, the point = (0, -2) and m = -√3
From point slope form equation,
⇒ y – (-2) = -√3 (x – 0)
⇒ y + 2 = -√3 x
⇒ √3 x + y + 2 = 0
Ans. The equation of line is √3 x + y – 2 = 0 and the line parallel to it is √3 x + y + 2 = 0.
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