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Algebra

Solving Equations

System of Linear Equations - 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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