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 9 - Solving Quadratic Equations - 9.6 - Solving Nonlinear Systems of Equations - Monitoring Progress - Page 526: 1

Answer

The solution is $(-1,-7)$.

Work Step by Step

The given system is $y=x^2+4x-4$ ...... (1) $y=2x-5$ ...... (2) Graph is each equation. The point of intersection is $A=(-1,-7)$. Check: $(x,y)=(-1,-7)$ Equation (1). $\Rightarrow y=x^2+4x-4$ $\Rightarrow -7=(-1)^2+4(-1)-4$ $\Rightarrow -7=1-4-4$ $\Rightarrow -7=1-8$ $\Rightarrow -7=-7$ True. Equation (2). $\Rightarrow y=2x-5$ $\Rightarrow -7=2(-1)-5$ $\Rightarrow -7=-2-5$ $\Rightarrow -7=-7$ True. Hence, the solution is $(-1,-7)$.
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