It's a circle. The equation of a circle is x^2+y^2=r^2. So the equation you've given is a circle with a radius of 4 and, since there are no modifications to the x or y values, the center of the circle is located at (0,0).
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Please re-word your questions a little better. There is insufficient information to answer this question.
Normally you would need the remainder of the equation to solve it. However, anything times one equals itself, so the answer (in part) is "2y". Remember, you can't solve the equation fully without finding the value of 'y', and you cannot find the value of 'y' unless you know what resides on the other side of the equal sign.
Your question isn't fully clear, but if you are referring to the process of division of numbers, the "number left over" is called a remainder.
18x + 24 6(3x + 4) is factored fully