If you're seeing this message, it means we're having trouble loading external resources for Khan Academy.
If you're behind a web filter, please make sure that the domains
*.kastatic.org and *.kasandbox.org are unblocked.
Intro to systems of equations
Whether in the real world or a cliche fantasy one, systems of equations are key to solving super-important issues like "the make-up of change in a troll's pocket". This tutorial shows you how to solve systems of equations graphically.
A troll forces us to use algebra to figure out the make-up of his currency. We end up setting up a system of equations.
Solving the system of equations visually. Now we can save the prince/princess.
Sal checks whether (-1,7) is a solution of the system: x+2y=13 and 3x-y=-11.
Verify whether a given pair of values is a solution to a system of equations.