2. (i) Find the value of k if the lines 7y = kx + 4...
2. (i) Find the value of k if the lines 7y = kx + 4...
2. (i) Find the value of k if the lines 7y = kx + 4 and x + 2y = 3 are perpendicular.
(ii) Prove that the lines 5x + 4y = 9 and 4x – 5y – 1 = 0 are perpendicular to each other?
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