If the no x-values repeat, yes it is a function so far I see it is a function.
Answer:
If you've more doubts you can ask :)
Step-by-step explanation:
If the centre of a circle is (a, b) and radius r, then the equation of the circle is :

<em><u>First we will find the centre, (a , b): </u></em>
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<em><u>Find radius:</u></em>

Diameter is the distance between (-1, 4) and (3, -2)


Therefore , 
<em><u>Equation of the circle is : </u></em>
<em><u></u></em>
Okay so to do the sqrt(75) you see if there are hidden squares. Split it to be the sqrt(25) and sqrt(3) then simplify. In the end, you get 5sqrt(3). Hope this helps!
Slope = (0 - 6)/(4 - 0) = -6/4 = -3/2