Solve each problem using a system of equations in two variables. See Example 6. The longest side of a right triangle is 13 m in length. One of the other sides is 7 m longer than the shortest side. Find the lengths of the two shorter sides of the triangle.

A system of equations consists of two or more equations with the same variables. To solve such a system, one must find the values of the variables that satisfy all equations simultaneously. This can be done using various methods, including substitution, elimination, or graphing. In this problem, we will set up equations based on the relationships described in the triangle.

A right triangle is defined by having one angle equal to 90 degrees. The sides of a right triangle are related by the Pythagorean theorem, which states that the square of the length of the hypotenuse (the longest side) is equal to the sum of the squares of the lengths of the other two sides. Understanding these properties is crucial for setting up the equations needed to solve the problem.

In algebra, variables are symbols used to represent unknown values. In this problem, we can represent the lengths of the two shorter sides of the triangle with variables, such as 'x' for the shortest side and 'y' for the longer side. Properly defining these variables based on the problem's context allows us to create equations that can be solved to find the actual lengths of the sides.