If f(x)=-6x+13 and g(x)=6-4(x-1) which is an equivalent form of f(x)+g(x)
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The answer is A. The line would run through the point (-6,8) and run parallel to the x -axis, tangent to the circle.
That polynomial is made up of 2 terms, 
and 7y, separated by a minus sign. To find the degree of a polynomial you consider the term with the highest degree, no matter that the variables are different. The degree on the first term is 5+2=7, whereas the degree on the second term is just 1. Since the degree of a polynomial is equal to the degree of the term that is highest, our degree is 7.