book Maths Puzzle Numerical Ability

Algebraically show whether the point M(2,-3) is on the line defined by
3x - 6y + 1 = 0

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square root of 1/16 A child throws a ball up a hill that makes an angle of 45 degrees with the horizontal. the ball lands 100 feet up the hill. Its trajectory is a parabola with the equation y=-xsquar