Ratio review. Ratio in words ratio in number type of ratio. Please see imagine

Place the following steps in order to complete the square and solve the quadratic equation,

What set does not contain -3 the set of all real numbers the set of all integers the set of all whole numbers the set of all rational numbers

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.