Algebra

Solving Equations

System of Linear Equations - Substitution

         

xx and yy are real numbers that satisfy x=7x = 7 and x+y=9x + y = 9. What is the value of yy?

xx and yy are real numbers that satisfy 2x=502x = 50 and x+y=40x + y = 40. What is the value of yy?

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 phone and 1 PS4 for $500, and
Kelvin bought 2 phones and 2 PS4's for $1000.
Linus bought 2 phones and 1 PS4.

Can we determine how much Linus paid?

xx and yy are real numbers that satisfy 5x8=75x -8 = 7 and 3x2y=93x - 2y = - 9. What is the value of yy?

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