exam Maths Puzzle Numerical Ability

Determine which two equations represent perpendicular lines.
y = x - 3
y = 3x -
y = x +
y = x -3

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exam Other Question

Three face cards from and ordinary deck of playing cards lie facedown in a horizontal row and are arranged such that immediately to the right of the king is a queen or two, immedia n (divided by) 5=20 r3