Big Ideas Math - Algebra 1, A Common Core Curriculum

Published by Big Ideas Learning LLC
ISBN 10: 978-1-60840-838-2
ISBN 13: 978-1-60840-838-2

Chapter 5 - Solving Systems of Linear Equations - Chapter Review - Page 282: 3

Answer

The solution is $(4,-1)$. The graph is shown below.

Work Step by Step

The given system of linear equation is $5x+5y=15$ ...... (1) $2x-2y=10$ ...... (2) Graph each equation. The intersection point is $(4,-1)$. Check the intersection point. Equation 1: $\Rightarrow 5x+5y=15$ $\Rightarrow 5(4)+5(-1)=15$ $\Rightarrow 20-5=15$ $\Rightarrow 15=15$ True. Equation 2: $\Rightarrow 2x-2y=10$ $\Rightarrow 2(4)-2(-1)=10$ $\Rightarrow 8+2=10$ $\Rightarrow 10=10$ True. Hence, the solution is $(4,-1)$.
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