# Inverse relationship between two variables means

### Examples of Inverse Relationships in Math | Sciencing

The relationship between two variables is a direct relationship if when one increases so does the other or as one decreases so does the other. The radius of a. Explore how we tell when two variables are in quadratic or inverse relationships in this lesson. Linear Relationship: Definition & Examples . A quadratic relationship is a mathematical relation between two variables that. Second, the relationship between two variables is not static and fluctuates over time, which means the variables may display an inverse.

A second way to look at inverse relations is to consider the type of curves they produce when you graph relationships between two variables.

**Directly and Inversely Proportional Relationships**

If the relationship between the variables is direct, then the dependent variable increases when you increase the independent variable, and the graph curves toward increasing values of both variables. However, if the relationship is an inverse one, the dependent variable gets smaller when the independent one increases, and the graph curves toward smaller values of the dependent variable.

Certain pairs of functions provide a third example of inverse relationships. Sciencing Video Vault Inverse Mathematical Operations Addition is the most basic of arithmetic operations, and it comes with an evil twin — subtraction — that can undo what it does. Let's say you start with 5 and you add 7.

You get 12, but if you subtract 7, you'll be left with the 5 with which you started. The inverse of addition is subtraction, and the net result of adding and subtracting the same number is equivalent of adding 0.

## What is an Inverse Relationship?

A similar inverse relationship exists between multiplication and division, but there's an important difference. The net result of multiplying and dividing a number by the same factor is to multiply the number by 1, which leaves it unchanged.

This inverse relationship is useful when simplifying complex algebraic expressions and solving equations. Another pair of inverse mathematical operations is raising a number to an exponent "n" and taking the nth root of the number. The square relationship is the easiest to consider. If you square 2, you get 4, and if you take the square root of 4, you get 2.

- Negative relationship
- Relationship Between Variables
- Variation, Direct and Inverse

This inverse relationship is also useful to remember when solving complex equations. This is an important component of direct variation: When one variable is 0, the other must be 0 as well. So, if two variables vary directly and one variable is multiplied by a constant, then the other variable is also multiplied by the same constant. If one variable doubles, the other doubles; if one triples, the other triples; if one is cut in half, so is the other.

### What is an Inverse Relationship? - Definition | Meaning | Example

In the preceding example, the equation is y 12x, with x representing the number of hours worked, y representing the pay, and 12 representing the hourly rate, the constant of proportionality. Graphically, the relationship between two variables that vary directly is represented by a ray that begins at the point 0, 0 and extends into the first quadrant.

In other words, the relationship is linear, considering only positive values. See part a of the figure on the next page. The slope of the ray depends on the value of k, the constant of proportionality.

The bigger k is, the steeper the graph, and vice versa.

Inverse Variation When two variables vary inversely, one increases as the other decreases. As one variable is multiplied by a given factor, the other variable is divided by that factor, which is, of course, equivalent to being multiplied by the reciprocal the multiplicative inverse of the factor.

For example, if one variable doubles, the other is divided by two multiplied by one-half ; if one triples, the other is divided by three multiplied by one-third ; if one is multiplied by two-thirds, the other is divided by two-thirds multiplied by three-halves.

Consider a situation in which miles are traveled. If traveling at an average rate of 5 miles per hour mphthe trip takes 20 hours.

If the average rate is doubled to 10 mph, then the trip time is halved to 10 hours. If the rate is doubled again, to 20 mph, the trip time is again halved, this time to 5 hours.

If the average rate of speed is 60 mph, this is triple 20 mph. Therefore, if it takes 5 hours at 20 mph, 5 is divided by 3 to find the travel time at 60 mph.

In general, variables that vary inversely can be expressed in the following forms: