For a ,a relationship to be a function, which values cannot repeat: the x- values or the y-values? *

The y-values repeat in various functions (for example: quadratic function: y=x²; y=4 for x=2 and for x=-2)  

step-by-step explanation:

not sure about this one man

point a is the center of the circle that passes through points e, f, and g and the center of the circle that passes through points x, y, and z.