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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. See more

Solve by Substitution

         

\(x\) and \(y\) are real numbers that satisfy \(x = 7\) and \(x + y = 9\). What is the value of \(y\)?

\(x\) and \(y\) are real numbers that satisfy \(2x = 50\) and \(x + y = 40\). What is the value of \(y\)?

Alice has 1 Facebook stock and 3 Twitter stocks, and her portfolio is worth $150.
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?

\(x\) and \(y\) are real numbers that satisfy \(5x -8 = 7\) and \(3x - 2y = - 9\). What is the value of \(y\)?

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