Explain why f(x) = x^2+4/x^2-2 is continuous at x = 2. a. f is defined at x = 2 b. f is not defined at x = 1 c. f is defined at x = -2 d. f is defined at x = 0

Aclassmate thinks that solving a system by graphing gives an exact answer when the lines appear to cross at a grid point, but only an approximate answer when they don't. explain why this isn't true.