Algebra 2 Common Core

Published by Prentice Hall
ISBN 10: 0133186024
ISBN 13: 978-0-13318-602-4

Chapter 4 - Quadratic Functions and Equations - 4-6 Complete the Square - Practice and Problem-Solving Exercises - Page 239: 97

Answer

The solution is $(3, 1)$.

Work Step by Step

Add the equations together: \begin{align*} 2x + y = \space \space7\\ \underline{-2x + 5y = -1}\\ 6y=6 \end{align*} Divide both sides of the equation by $6$: $$y = 1$$ Substitute this value for $y$ into the first equation to find $x$: $$2x + 1 = 7\\ 2x = 6\\ x=\frac{6}{2}\\ x=3$$ The solution is $(3, 1)$.
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