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Solve for a

Graph the equation by plotting point x=2

Does the point (1, sqrt 7) lie on circle shown.

What is the equation of the line in point-slope form? y+ 4 = 1/2(x+4) y-4 = 1/2(x + 4) y-0 = 2(x - 4) y-4 = 2(8-0)