The area of a rectangle is 6+3x square feet. which of the following expressions could represent the lengths of the sides of the rectangle? a. 6 and 3x. b. 3and 2+x. c. 6 and 6+x. d. 3 and 2+3x

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.