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Ch. 7 - Conic Sections
Blitzer - College Algebra 8th Edition
Blitzer8th EditionCollege AlgebraISBN: 9780136970514Non è quello che usi tu?Cambia libro di testo
Tutti i libri di testoBlitzer 8th EditionCh. 7 - Conic SectionsProblema 63
Capitolo 8, Problema 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.
{(y−2)2 =x+4y=−(12)x\(\left\)\{\(\begin{array}{l}\)\(\left\)(y-2\(\right\))^2\(\text{ }\)=x+4\\ y=-\(\text{(}\[\frac\)12\(\text{)}\)x\(\end{array}\]\right\).

Guida verificata passo dopo passo
1
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.

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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.
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Graphing Equations of Two Variables by Plotting Points

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.
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Solving Systems of Equations - Substitution

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.
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Linear Inequalities with Fractions & Variables on Both Sides
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