Which statement is true? 1.The graph of a two-variable equation consists of only two points: one with a zero y-coordinate, (a,0), and one with a zero x-coordinate, (0,b).
2. The graph of a two-variable equation is a single point that solves the equation.
3.The graph of a two-variable equation is the set of all points in the coordinate plane that solve the equation.
4. The graph of a two-variable equation is the set of all positive points that solve the equation.