College Algebra 7th Edition

Published by Brooks Cole
ISBN 10: 1305115546
ISBN 13: 978-1-30511-554-5

Chapter 5, Systems of Equations and Inequalities - Section 5.4 - Systems of Nonlinear Equations - 5.4 Exercises - Page 465: 9

Answer

$(3, 4)$ and $(-3, 4)$

Work Step by Step

With the elimination method, we can see that the $x^{2}$ term can be eliminated. $x^{2} - 2y = 1$ $x^{2} + 5y = 29$ We subtract the second equation from the first equation to get: $-7y = - 28$ Solve for $y$ by dividing both sides by $-7$: $y = 4$ Now that we have the value for $y$, we can plug it into one of the equations to solve for $x$: $x^{2} - 2(4) = 1$ $x^{2} - 8 = 1$ Add $8$ on both sides: $x^{2} = 9$ Take the square root of both sides to get: $x = 3$ or $x = -3$ We now know that there are two points where these equations intersect, which are $(3, 4)$ and $(-3, 4)$.
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