Ch. 7 - Conic Sections

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Blitzer 8th Edition

Ch. 7 - Conic Sections

문제 63

8장, 문제 63

In Exercises 63–68, find the solution set for each system by graphing both of the system's equations in the same rectangular coordinate system and finding points of intersection. Check all solutions in both equations.
${\begin{matrix} {(y - 2)}^{2} = x + 4 \\ y = - (\frac{1}{2}) x \end{matrix}$

검증된 단계별 안내

Rewrite the first equation

(^{y - 2)} 2 = x + 4

to express

x

in terms of

y

. Subtract 4 from both sides to get

x = (^{y - 2)} 2 - 4

The second equation is already solved for

y

y = -rac{1}{2} x

. This is a linear equation representing a straight line.

Graph the parabola from step 1 by plotting points for various values of

y

and calculating corresponding

x

values using

x = (y - 2)^2 - 4

. This will give you the shape of the parabola on the coordinate plane.

Graph the line

y = -rac{1}{2} x

by choosing values for

x

and finding corresponding

y

values. Plot these points and draw the line.

Identify the points where the parabola and the line intersect on the graph. These intersection points are the solutions to the system. Substitute these points back into both original equations to verify they satisfy both equations.

비슷한 문제에 대한 검증된 영상 답변:

이 영상 해법은 위 문제에 도움이 된다고 튜터들이 추천한 것입니다.

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주요 개념

질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.

Graphing Equations

Graphing involves plotting points that satisfy an equation on the coordinate plane. For this system, one equation is nonlinear (a parabola) and the other is linear. Understanding how to graph both accurately helps visualize their intersection points, which represent the solutions.

Solving Systems of Equations by Graphing

A system's solution set consists of points that satisfy all equations simultaneously. Graphing both equations on the same axes allows identification of intersection points, which correspond to these solutions. This method provides a visual approach to solving systems.

Checking Solutions in Both Equations

After finding intersection points, substituting them back into both original equations verifies their validity. This step ensures that the solutions satisfy both equations, confirming the accuracy of the graphing method and ruling out extraneous points.