book Maths Puzzle Numerical Ability

The endpoints of a diameter of a circle are (-2,1) and (6, -5).

Write the standard equationof the circle?

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Find an equation of the line passing through the two points. Write the equation in standard form. (8,2) and (3,6) 1/2(x-20) - 1/5(x+15) = 1/2x - 10 - 1/5x + 3 = LCD 5/10x - 10 - 2/10x + 3 =5/10x - 10 + 10 = 2/10x + 3 + 10= 5/10x = 2/10x + 13
I get this far and am not sure how to proceed, can