exam Maths Puzzle Numerical Ability

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Solve by the addition method

5x -3y= -20
3x + 2y= 7

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exam Other Question

FIND THE DISTANCE BETWEEN THE POINTS A(4,-3) AND B(-4,3). Line t is parallel to the line y=3x+2 and passes thru the highest point on the graph of y=x(10-x). What is the equation of t?

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