November 11, 2022

Y-Intercept - Meaning, Examples

As a student, you are always seeking to keep up in class to avert getting overwhelmed by subjects. As parents, you are constantly researching how to encourage your kids to prosper in school and furthermore.

It’s especially important to keep the pace in math because the theories continually founded on themselves. If you don’t comprehend a particular lesson, it may haunt you in next lessons. Understanding y-intercepts is a perfect example of topics that you will revisit in mathematics time and time again

Let’s go through the basics regarding the y-intercept and show you some tips and tricks for solving it. Whether you're a mathematical whiz or just starting, this preface will enable you with all the things you need to learn and instruments you need to tackle linear equations. Let's jump directly to it!

What Is the Y-intercept?

To fully understand the y-intercept, let's imagine a coordinate plane.

In a coordinate plane, two straight lines intersect at a section called the origin. This junction is where the x-axis and y-axis meet. This means that the y value is 0, and the x value is 0. The coordinates are noted like this: (0,0).

The x-axis is the horizontal line passing through, and the y-axis is the vertical line traveling up and down. Every axis is counted so that we can specific points on the plane. The vales on the x-axis increase as we move to the right of the origin, and the numbers on the y-axis rise as we shift up along the origin.

Now that we have reviewed the coordinate plane, we can define the y-intercept.

Meaning of the Y-Intercept

The y-intercept can be taken into account as the starting point in a linear equation. It is the y-coordinate at which the coordinates of that equation overlaps the y-axis. In other words, it represents the value that y takes while x equals zero. Next, we will show you a real-world example.

Example of the Y-Intercept

Let's suppose you are driving on a straight highway with one lane going in each direction. If you begin at point 0, where you are sitting in your vehicle this instance, then your y-intercept would be similar to 0 – since you haven't shifted yet!

As you begin you are going the track and picking up speed, your y-intercept will increase before it reaches some greater value once you arrive at a end of the road or stop to induce a turn. Therefore, while the y-intercept might not look especially important at first glance, it can give details into how objects change over time and space as we move through our world.

Therefore,— if you're ever puzzled trying to understand this theory, remember that just about everything starts somewhere—even your journey down that straight road!

How to Discover the y-intercept of a Line

Let's consider about how we can find this number. To support you with the process, we will outline a handful of steps to do so. Then, we will offer some examples to show you the process.

Steps to Find the y-intercept

The steps to locate a line that crosses the y-axis are as follows:

1. Search for the equation of the line in slope-intercept form (We will dive into details on this later in this tutorial), which should look something like this: y = mx + b

2. Substitute the value of x with 0

3. Work out y

Now that we have gone through the steps, let's see how this method would work with an example equation.

Example 1

Discover the y-intercept of the line described by the formula: y = 2x + 3

In this instance, we can replace in 0 for x and work out y to locate that the y-intercept is the value 3. Consequently, we can say that the line intersects the y-axis at the point (0,3).

Example 2

As one more example, let's take the equation y = -5x + 2. In this case, if we substitute in 0 for x one more time and work out y, we discover that the y-intercept is equal to 2. Thus, the line crosses the y-axis at the point (0,2).

What Is the Slope-Intercept Form?

The slope-intercept form is a procedure of depicting linear equations. It is the cost common form employed to express a straight line in mathematical and scientific subjects.

The slope-intercept equation of a line is y = mx + b. In this function, m is the slope of the line, and b is the y-intercept.

As we checked in the last section, the y-intercept is the coordinate where the line intersects the y-axis. The slope‌ is a scale of the inclination the line is. It is the unit of change in y regarding x, or how much y changes for each unit that x shifts.

Now that we have went through the slope-intercept form, let's check out how we can use it to discover the y-intercept of a line or a graph.


Detect the y-intercept of the line signified by the equation: y = -2x + 5

In this case, we can see that m = -2 and b = 5. Therefore, the y-intercept is equal to 5. Thus, we can say that the line goes through the y-axis at the point (0,5).

We could take it a step higher to illustrate the inclination of the line. In accordance with the equation, we know the inclination is -2. Replace 1 for x and figure out:

y = (-2*1) + 5

y = 3

The solution tells us that the next point on the line is (1,3). Once x replaced by 1 unit, y changed by -2 units.

Grade Potential Can Help You with the y-intercept

You will revisit the XY axis time and time again during your math and science studies. Theories will get further complicated as you advance from solving a linear equation to a quadratic function.

The time to master your comprehending of y-intercepts is now prior you fall behind. Grade Potential provides expert instructors that will help you practice finding the y-intercept. Their tailor-made explanations and practice questions will make a positive difference in the outcomes of your exam scores.

Anytime you think you’re lost or stuck, Grade Potential is here to assist!