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Without drawing, determine which of the following pairs of lines are perpendicular.
(a) y= 3x– 1
y = `3/2`x - 4
(b) y = `2/3`x + 4
2y+3x=8
(c) 2y – 7x = 4
y= `2/7`x - `1/2`
(d) y= -`3/4`x - 2
y= -`4/3`x + 5.