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Ch. 5 - Systems of Equations and Inequalities
Blitzer - College Algebra 8th Edition
Blitzer8th EditionCollege AlgebraISBN: 9780136970514Not the one you use?Change textbook
All textbooksBlitzer 8th EditionCh. 5 - Systems of Equations and InequalitiesProblem 33
Chapter 6, Problem 33

Graph the solution set of each system of inequalities or indicate that the system has no solution.
{x+2y≤4y≥x−3\(\begin{cases}\)x + 2y \(\leq\) 4 \(\y\) \(\geq\) x - 3\(\end{cases}\)

Verified step by step guidance
1
Start by rewriting each inequality to understand the boundary lines. For the first inequality, \(x + 5y \leq 8\), rewrite it in slope-intercept form by isolating \(y\): \(5y \leq 8 - x\), then \(y \leq \frac{8 - x}{5}\).
For the second inequality, \(y \geq x - 6\), the boundary line is \(y = x - 6\). This is already in slope-intercept form with slope 1 and y-intercept -6.
Graph the boundary lines on the coordinate plane. For \(y = \frac{8 - x}{5}\), plot points or use intercepts: when \(x=0\), \(y=\frac{8}{5}\); when \(y=0\), \(x=8\). For \(y = x - 6\), plot points such as \((0, -6)\) and \((6, 0)\).
Determine the shading for each inequality. For \(y \leq \frac{8 - x}{5}\), shade the region below or on the line. For \(y \geq x - 6\), shade the region above or on the line.
The solution set to the system is the intersection of the shaded regions from both inequalities. Identify this overlapping region on the graph, which represents all points satisfying both inequalities simultaneously.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Graphing Linear Inequalities

Graphing linear inequalities involves shading the region of the coordinate plane that satisfies the inequality. The boundary line, given by the related equation, is drawn solid if the inequality includes equality (≤ or ≥) and dashed if it does not (< or >). Points on the shaded side satisfy the inequality.
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Linear Inequalities

System of Inequalities

A system of inequalities consists of two or more inequalities considered together. The solution set is the intersection of the regions that satisfy each inequality individually. Graphing the system helps visualize where these regions overlap, representing all solutions that satisfy every inequality.
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Slope-Intercept Form and Boundary Lines

Converting inequalities to slope-intercept form (y = mx + b) helps in graphing the boundary lines easily. For example, y ≤ (-1/5)x + 8/5 is derived from x + 5y ≤ 8. Understanding slope and intercepts allows accurate drawing of boundary lines, which define the edges of the solution regions.
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Related Practice
Textbook Question

In Exercises 29–42, solve each system by the method of your choice. {x2+4y2=20x+2y=6\(\begin{cases}\)x^2 + 4y^2 = 20 \(\x\) + 2y = 6\(\end{cases}\)

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Textbook Question

In Exercises 31–42, solve by the method of your choice. Identify systems with no solution and systems with infinitely many solutions, using set notation to express their solution sets. x = 9-2y x + 2y = 13

Textbook Question

Write the partial fraction decomposition of each rational expression. 5x2+6x+3/(x + 1)(x² + 2x + 2)

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Textbook Question

In Exercises 31–42, solve by the method of your choice. Identify systems with no solution and systems with infinitely many solutions, using set notation to express their solution sets. y = 3x - 5 21x - 35 = 7y

Textbook Question

In Exercises 29–42, solve each system by the method of your choice. {2x2+y2=18xy=4\(\begin{cases}\)2x^2 + y^2 = 18 \(\xy\) = 4\(\end{cases}\)

Textbook Question

Write the partial fraction decomposition of each rational expression. x+4/x² (x²+4)

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