28. Which pair of lines are parallel? a. x+7y-2=0, 7=(2,5) + s(1,7), s € R b. 3x-4y-2=0, 7 = (1,4) + s(-3,4), s € R c. 2x+2y+2=0, 7 = (1,2)+s(1,-1), s € R d. none of the above

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