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

Trapezoid tuvw is shown on the coordinate plane below: trapezoid tuvw on the coordinate plane with ordered pairs at t 4, 6, at u 7, 6, at v 7, 3, at w 2, 3. if trapezoid t'u'v'w' represents trapezoid tuvw reflected over the y-axis, the ordered pair of w' is (note: you must include parentheses, a comma, and a space after the comma when typing the ordered pair.)