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Systems of Equations and Inequalities. $$y \geq \log _{2}(x+1)$$

Short Answer

Expert verified
The solution to the inequality \(y \geq \log_{2}(x+1)\) is \(x \leq 2^y - 1\).

Step by step solution

01

Isolate the logarithmic expression

The inequality is already in the simplest form with \(y\) isolated, so we can move on to the next step.
02

Convert the logarithmic inequality to an exponential inequality

The equation \(y = \log_{2}(x+1)\) can equivalently be written as \(2^y = x+1\) by using the property of logarithms that: if \(y = \log_{b}(x)\), then \(x = b^y\). Now, since the original inequality is \(y \geq \log_{2}(x+1)\), we should preserve the inequality as \(2^y \geq x+1\).
03

Solve for \(x\)

We need to solve the inequality \(2^y \geq x+1\) for \(x\). Doing so, we find that \(x \leq 2^y - 1\), which means \(x\) is less than or equal to \(2^y\) subtracted by 1.

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Key Concepts

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

Systems of Equations
Understanding systems of equations is crucial for students to solve problems that involve finding the values of two or more unknowns that are interconnected. A system of equations consists of two or more equations with the same set of variables. In a graphical approach, the solution of a system of equations is represented by the point or points where the graphs of the equations intersect.

When dealing with inequalities within these systems, the solution set will often be a region rather than a single point. For example, in the given inequality problem, the inequality defines a border in the coordinate plane. Any point in the plane that makes the inequality true is part of the solution set. It is important to understand how to graph these inequalities to visualize the set of possible solutions.
Exponential Functions
Exponential functions are one of the most important classes of functions in mathematics, defined by an equation of the form \(f(x) = b^x\), where \(b\) is a positive real number, and not equal to 1. These functions are characterized by their rapid growth or decay depending on the base \(b\).

In the context of our exercise, the function \(2^y\) is an exponential function where the base is 2. This implies that for every increase in \(y\), the result, or \(x\) value, doubles. The importance of understanding exponential functions in solving inequalities comes from knowing how their graphs behave and how the growth rate can affect the range of solutions for \(x\).
Inequality Solving
Solving inequalities is a fundamental skill in mathematics. Inequalities tell us about the relative size of two values and are represented using symbols such as \( < \), \(( \le \)), \(( > \)), and \(( \ge \)). Unlike equations, inequalities do not have one precise solution but a set of solutions that satisfy the inequality condition.

In our problem, converting the logarithmic inequality to an exponential form was the key step before solving for \(x\). In solving inequalities, we must ensure that the sense of the inequality (which side is larger or smaller) is preserved correctly during the manipulation of terms. Whenever we multiply or divide by a negative number, we must remember to flip the inequality sign.
Logarithmic Expressions
Logarithmic expressions are the inverse operations of exponential functions, represented by \(y = \log_b(x)\), which answers the question: 'To what power must we raise \(b\) to obtain \(x\)?' Logarithms have various properties that make them useful in solving exponential equations and inequalities. One such property that is essential for solving logarithmic inequalities, like the one given, is understanding that if \(y = \log_{b}(x)\), then the equivalent exponential form is \(x = b^y\).

In the context of inequality and exponential relationships, students must grasp how logarithms map the multiplicative scale of an exponential function back to an additive scale. This factor is beneficial when solving for a variable that is inside a logarithm, such as in our exercise. By converting the logarithmic inequality to an exponential form, we can solve it using the techniques applicable to linear inequalities.

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Most popular questions from this chapter

The function $$f(t)=\frac{25.1}{1+2.7 e^{-0.05 t}}$$ models the population of Florida, \(f(t),\) in millions, \(t\) years after \(1970 .\) a. What was Florida's population in \(1970 ?\) b. According to this logistic growth model, what was Florida's population, to the nearest tenth of a million. in \(2010 ?\) Does this underestimate or overestimate the actual 2010 population of 18.8 million? c. What is the limiting size of the population of Florida?

Use the two steps for solving a linear programming problem, given in the box on page \(888,\) to solve the problems. A theater is presenting a program for students and their parents on drinking and driving. The proceeds will be donated to a local alcohol information center. Admission is 2.00 for parents and 1.00 for students. However, the situation has two constraints: The theater can hold no more than 150 people and every two parents must bring at least one student. How many parents and students should attend to raise the maximum amount of money?

Exercises \(41-43\) will help you prepare for the material covered in the first section of the next chapter. Consider the following array of numbers: $$\left[\begin{array}{rrr} {1} & {2} & {-1} \\ {4} & {-3} & {-15} \end{array}\right]$$ Rewrite the array as follows: Multiply each number in the top row by -4 and add this product to the corresponding number in the bottom row. Do not change the numbers in the top row.

A company that manufactures small canoes has a fixed cost of \(\$ 18,000 .\) It costs \(\$ 20\) to produce each canoe. The selling price is \(\$ 80\) per canoe. (In solving this exercise, let \(x\) represent the number of canoes produced and sold.)

If \(x=3, y=2,\) and \(z=-3,\) does the ordered triple \((x, y, z)\) satisfy the equation \(2 x-y+4 z=-8 ?\)

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