Tyrone re sells 3 pairs of Yeezys and a pair of Nikes for 250$. Nucci re sells a pair of Yeezys and Nikes for 150$ How much does a pair of Yeezys cost?

Let y be the cost of Yeezy's and n be the cost of Nike's. We're given two equations:

3y + n = 250

y + n = 150

We have a system of equations, and we can solve it using one of three ways: