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Calculate k to the R lines (x+2y-3 = 0) and S (x-ky +4 = 0) are parallel and perpendicular

The exercise is about to calculate * k * for the straights * R (x+2y-3 = 0) and S (x-ky +4 = 0) * are parallel and perpendicular. The theme is: the straight line or studies of the straight lines, please I need help, who can help me, in order to verify the exercises that I decided to see if they are correct and it is that I have some problems to be able to find a k, who can solve these 2 exercises are thank you in advance

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