book Maths Puzzle Numerical Ability

Find the slope, if it exists, of the line containing the pair of points (4,-8) , and (-7,-8)

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book Other Question

What is a supplementary? An equalateral triangle and a circle have the same center. The area of triangle not in the circle = the area of the circle not in the triangle. If the radius of the circle is 1 find the length of the side of the triangle.