Learn how to solve a system of equations by substitution. To solve a system of equations means to obtain a common values of ...

Learn how to solve a system of equations by using any method such as graphing, elimination, and substitution. 4x-3y=8, ...

Math teachers have stymied students for hundreds of years by sticking goats in strangely shaped fields. Learn why one grazing goat problem has stumped mathematicians for more than a century. If you’ve ...

Alan Veliz-Cuba has received funding from the Simons Foundation and the American Mathematical Society for some of his research. You can probably think of a time when you’ve used math to solve an ...