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 - Exercises - Page 530: 9

Answer

The solution is $(-1,2)$.

Work Step by Step

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