Question: For nonzero values of a, b, c, and d, show that (a) Lines ax + by + c = 0 and ax + by +

For nonzero values of a, b, c, and d, show that 

(a) Lines ax + by + c = 0 and ax + by + d = 0 are parallel, 

(b) Lines ax + by + c = 0 and bx − ay + d = 0 are perpendicular.

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