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# Solving Equations

From supply and demand to position and velocity, equations model the world around us. Equip yourself with the tools necessary to solve for x.

Brenda has 2 Facebook stocks and 1 Twitter stock, and her portfolio is worth $250.

Candice has 3 Facebook stocks and 1 Twitter stock. How much is her portfolio worth?

On Black Friday,

Joel bought 1 Galaxy S6 and 1 PS4 for $500, and

Kelvin bought 2 Galaxy S6's and 2 PS4's for $1000.

Linus bought 2 Galaxy S6's and 1 PS4.

Can we determine how much Linus paid?

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