exam Maths Puzzle Numerical Ability

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

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exam Other Question

Solve the folling 2 x 2 systems using substitutions

y= 3x + 12
y= -x +4 find the slope of the passing through the following points:
(2, 0) and (0, -4)

A. 2
B. -2
C. 1/2
D. -1/2

Thank you for any help...