book Maths Puzzle Numerical Ability

How do you find the answers to y=mx+b. I just dont understand. Please help

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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. Find the eccentricity of the ellipse given by 16x^2 + 25y^2=100