We know that:

is an equation of a circle.
When we substitute x and y (from the pairs we have), we'll get a system of equations:

and all we have to do is solve it for a, b and r.
There will be:

From equations (II) and (III) we have:

and from (I) and (II):

Now we can easly calculate a and b:

Finally we calculate

:

And the equation of the circle is:
44 is the answer cause xs cancel out
Answer:
Option 5 & 6
Step by Step Explanation:
8 / 0.95 = 8.4 ( wrong )
18 / 2.2 = 8.18 ( wrong )
47.6 / 3.9 = 16.41 ( wrong )
10.6 / 1.89 = 5.6 ( wrong )
71.9 / 6.5 = 11.061 ( correct )
123.4 / 9.2 = 13.41 ( correct )
157.4 / 16.4 = 9.59 ( wrong )
hope this helps! please give brainliest and thanks!!!
Answer:
x = 21/10
Step-by-step explanation:
3/10 = x/7
Cross multiply.
10x = 21
x = 21/10