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Without drawing, determine which of the following pairs of lines are perpendicular:
(a) y = 2x + 7
y= -#1/2#x+3
(b) 3y = x + 3
y = –3x – 2
(c) y = 2x + 71
y =-2x+5
(d) y = 5x + 1
5y =10 – x