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Systems of Equations and Inequalities. $$y>2^{x}$$

Short Answer

Expert verified
The inequality \( y > 2^{x} \) represents all the points in the coordinate plane, such that value of y at these points is greater than \( 2^{x} \). A graph of this inequality would be a plot of the line \( y = 2^{x} \) with a dashed line, and the area above this line shaded, which signifies that all these points are part of the solution.

Step by step solution

01

Determine the inequality

The inequality given is \( y > 2^{x} \). This means we are looking for all values on the graph where the y-coordinate is greater than the value of \( 2^{x} \).
02

Plot the function

We start by merely plotting \( y = 2^{x} \) as if it were an equality. This would be a simple exponential graph, which starts from (0,1) and goes upwards, continuously increasing as we go to the right. When x is less than 0, the values of y will be between 0 and 1.
03

Shade the region of the solution

Since, the inequality we have is \( y > 2^{x} \), we shade the region above the curve of \( y = 2^{x} \), because 'y' values greater than \( 2^{x} \) are what makes our given inequality true.
04

Make the line dashed

We draw the border line of the graph, \( y = 2^{x} \), as a dashed line because the original inequality does not have an 'or equal to' condition. This signifies that points lying on the line are not included in the solution of this inequality.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Exponential Functions
Exponential functions represent one of the most important types of functions in mathematics. They are characterized by an equation of the form \( f(x) = a^{x} \), where 'a' is a constant base greater than 0, and 'x' is the exponent. The base 'a' determines the rate at which the function grows or decays depending on whether it's greater than 1 or between 0 and 1, respectively.

Understanding the behavior of exponential functions is crucial when dealing with compound interest, population growth, radioactive decay, and much more. The function \( y = 2^{x} \) from our exercise is a classic example of exponential growth, where the base, 2, indicates the function doubles every time 'x' increases by one unit.
Graphing Inequalities
Graphing inequalities on a coordinate plane involves identifying all the points that satisfy the inequality. To do this effectively, one must first recognize the border represented by the associated equation (the inequality replaces the 'greater than', 'less than', 'greater than or equal to', or 'less than or equal to' with an equals sign).

In our case, the border is the line \( y = 2^{x} \), but since the inequality is strict (\( y > 2^{x} \)), the line will be dashed to demonstrate that the points on the line are not included in the solution set. The region where the inequality holds true is then shaded—in this scenario, above the dashed line—to visually capture the set of points that satisfy the inequality.

Moreover, if the inequality includes 'or equal to' (\( \geq \) or \( \leq \)), the line would be solid instead of dashed to reflect that points on the line are included in the solution.
Plotting Exponential Graphs
Plotting exponential graphs is a way to visualize exponential functions. The graph of an exponential function like \( y = 2^{x} \) typically starts at a point determined by its y-intercept, which is the value of y when x equals zero. For \( y = 2^{x} \), this point is (0, 1). As x increases, the value of y increases rapidly for a base greater than 1, while it approaches zero for x decreasing.

When graphing, it is helpful to choose a range of x-values and calculate the corresponding y-values. This creates a set of points that can be plotted and then connected to show the shape of the graph. It's also informative to note how the graph behaves as x approaches positive or negative infinity. For \( y = 2^{x} \), as x goes to infinity, y grows without bound, and as x goes to negative infinity, y approaches zero, but never quite reaches it—representing a horizontal asymptote.

Keeping these characteristics in mind while plotting can help ensure that you draw the graph accurately and that it represents the true nature of the exponential function.

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Most popular questions from this chapter

You invest in a new play. The cost includes an overhead of \(\$ 30,000,\) plus production costs of \(\$ 2500\) per performance. A sold-out performance brings in \(\$ 3125 .\) (In solving this exercise, let \(x\) represent the number of sold-out performances.

When using the addition or substitution method, how can you tell if a system of linear equations has infinitely many solutions? What is the relationship between the graphs of the two equations?

A television manufacturer makes rear-projection and plasma televisions. The profit per unit is 125 for the rear-projection televisions and 200 for the plasma televisions. a. Let \(x=\) the number of rear-projection televisions manufactured in a month and let \(y=\) the number of plasma televisions manufactured in a month. Write the objective function that models the total monthly profit. b. The manufacturer is bound by the following constraints: \(\cdot\) Equipment in the factory allows for making at most 450 rear-projection televisions in one month. \(\cdot\) Equipment in the factory allows for making at most 200 plasma televisions in one month. \(\cdot\) The cost to the manufacturer per unit is 600 for the rear-projection televisions and 900 for the plasma televisions. Total monthly costs cannot exceed 360,000. Write a system of three inequalities that models these constraints. c. Graph the system of inequalities in part (b). Use only the first quadrant and its boundary, because \(x\) and \(y\) must both be nonnegative. d. Evaluate the objective function for total monthly profit at each of the five vertices of the graphed region. [The vertices should occur at \((0,0),(0,200),(300,200)\) \((450,100), \text { and }(450,0) .]\) e. Complete the missing portions of this statement: The television manufacturer will make the greatest profit by manufacturing _____ rear- projection televisions each month and _____ \(-\) plasma televisions each month. The maximum monthly profit is $_____.

What is a constraint in a linear programming problem? How is a constraint represented?

Determine whether each statement makes sense or does not make sense, and explain your reasoning. Even if a linear system has a solution set involving fractions, such as \(\left\\{\left(\frac{8}{11}, \frac{43}{11}\right)\right\\},\) I can use graphs to determine if the solution set is reasonable.

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