In the following example solve does not find a solution to the set of equations and as mentioned above in the Description section if the second argument variables is a set the empty sequence is returned. In solving a system of equations we try to find values for each of the unknowns that will satisfy every equation in the system. For example 3x 2y 8 is a linear equation in two variables.
So the first big idea is no one can ask you to solve a single equation with two variables because it would have an infinite number of solutions.
When we solve this equation we get x1 y0 as one of the solutions. So we need to solve for l. Perimeter is equal to 2 times the length plus 2 times the width. Given a system of two equations in two variables solve using the substitution method.