Graph each inequality. y \u003e 2x + 1

Ch. 5 - Systems and Matrices

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Lial 13th Edition

Ch. 5 - Systems and Matrices

문제 27

6장, 문제 27

Graph each inequality. y > 2^x + 1

검증된 단계별 안내

Identify the boundary curve by rewriting the inequality as an equation: $y = 2^{x} + 1$. This curve will help us determine the region to shade.

Graph the function $y = 2^{x} + 1$. Since \$2^{x}$ is an exponential function, the graph will rise rapidly as $x$ increases, and the entire graph will be shifted up by 1 unit.

Because the inequality is strict ($y > 2^{x} + 1$), draw the boundary curve as a dashed line to indicate that points on the curve are not included in the solution set.

Choose a test point not on the boundary curve, such as $(0,0)$, and substitute it into the inequality $y > 2^{x} + 1$ to check if it satisfies the inequality. If it does, shade the region containing that point; if not, shade the opposite side.

Shade the region above the dashed curve $y = 2^{x} + 1$ to represent all points where $y$ is greater than $2^{x} + 1$, completing the graph of the inequality.

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주요 개념

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

Exponential Functions

An exponential function has the form y = a^x, where the variable is in the exponent. In this question, y = 2^x + 1 shifts the basic exponential graph y = 2^x upward by 1 unit. Understanding the shape and behavior of exponential functions is essential for graphing and interpreting inequalities involving them.

Graphing Inequalities

Graphing inequalities involves shading the region of the coordinate plane that satisfies the inequality. For y > 2^x + 1, you first graph the boundary curve y = 2^x + 1, then shade the area above this curve because y is greater than the function values. The boundary is usually drawn as a dashed line when the inequality is strict (>) to indicate points on the line are not included.

Transformations of Functions

Transformations modify the graph of a function by shifting, stretching, or reflecting it. The '+1' in y = 2^x + 1 shifts the graph of y = 2^x vertically upward by 1 unit. Recognizing such transformations helps in accurately plotting the function and understanding how the inequality's boundary changes.

Graph each inequality. y > 2x + 1