Which systems of equations have no solution? x + 4y = 23 -3x = 12y + 1 2x + y = 17 -4x = 2y - 34 2x + 4y = 22 -X = 2y - 11 3y = 10 - x 2x + y = 7 2x + y = 15 x = 15 - 2y y = 13 - 2x 4x - y = -1

If the endpoints of the diameter of a circle are (8, 6) and (2,0), what is the standard form equation of the circle? a) (x + 5)2 + (y + 3)2 = 18 (x + 5)2 + (y + 3)2 = 3.72 (x - 5)2 + (y - 3)2 = 18 d) (x - 5)2 + (y - 3)2 = 32