exam Maths Puzzle Numerical Ability

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...

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thankyou. I hope someone can help me. Which one of the following statements is true for trigonometric functions of two acute angles A and B in a right triangle?
A cosB=tanA
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