exam Maths Puzzle Numerical Ability

Using coordinate geometry, prove the the diagonals of a rhombus are perpendicular.

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exam Other Question

IF Y VARIES INVERSELY WITH X, AND IF Y=7 WHEN X=5, FIND Y WHEN X IS 7 The difference of 2 numbers is 11. The second is 3 less than 2 times the first. What are the 2 numbers?