Simultaneous equations are a set of equations with multiple variables that are solved together to find a common solution. For example, if you have two equations with two variables, such as x and y, the goal is to find values for both variables that satisfy both equations at the same time. These equations can be solved using various methods, including substitution, elimination, or graphing. The solution represents the point where the graphs of the equations intersect, indicating the values of x and y that make both equations true simultaneously.