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Find the values of k for which the lineis
(a) Parallel to the x-axis,
(b) Parallel to the y-axis,
(c) Passing through the origin.
The given equation of line is
(k – 3) x – (4 – k2) y + k2 – 7k + 6 = 0 … (1)
(a) If the given line is parallel to the x-axis, then
Slope of the given line = Slope of the x-axis
The given line can be written as
(4 – k2) y = (k – 3) x + k2 – 7k + 6 = 0
, which is of the form y = mx + c.
∴Slope of the given line =
Slope of the x-axis = 0
Thus, if the given line is parallel to the x-axis, then the value of k is 3.
(b) If the given line is parallel to the y-axis, it is vertical. Hence, its slope will be undefined.
The slope of the given line is.
Now, is undefined at k2 = 4
k2 = 4
⇒ k = ±2
Thus, if the given line is parallel to the y-axis, then the value of k is ±2.
(c) If the given line is passing through the origin, then point (0, 0) satisfies the
given equation of line.
Thus, if the given line is passing through the origin, then the value of k is either 1 or 6.
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