Test: PSAT Math

1.

Which set of lines is perpendicular?

the line between the points (1,3) and (3,5), and y = 4x + 7

the line between the points (7,4) and (4,7), and the line between the points (3,9) and (4,8)

y = x – 1/2 and y = –x + 1/2

y = 3x + 5 and y = 5x + 3

y = 3x/5 – 3 and y = 5x/3 + 3

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