Which rule describes a linear relation?

a. double x and subtract five to get y.
b. multiply x and y to get 20.
c. multiply x times itself and add five to get y.
d. divide 40 by x to get y.

Nellie is analyzing a quadratic function f(x) and a linear function g(x). will they intersect? f(x) g(x) graph of the function f of x equals one half times x squared, plus 2 x g(x) 1 5 2 10 3 15