Another common type of average problems is the average speed computation.
Then, see how find the value of that variable and use it to find the value of the other variable. There are many different ways to solve a system of linear equations.
In this tutorial, you'll see how to solve such a system by combining the equations together in a way so that one of the variables is eliminated.
$$y=2x 4$$ $x y=9$$ We can substitute y in the second equation with the first equation since y = y.
in the first equation $$y=2x 4$$ $$y=2\cdot 4$$ $$y=6$$ The solution of the linear system is (1, 6).