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Which values for a and b will create infinitely many solutions for this system of equations? ax-y=8 2x+y=b

What number should be added to both sides of the equation to complete this square? x^2-10x=7

Circle d circumscribes abc and abe. which statements about the triangles are true? statement i: the perpendicular bisectors of abc intersect at the same point as those of abe. statement ii: the distance from c to d is the same as the distance from d to e. statement iii: bisects cde. statement iv: the angle bisectors of abc intersect at the same point as those of abe. a. i only b. i and ii c. ii and iv d. i and iii e. iii and iv