November 11, 2022

Y-Intercept - Meaning, Examples

As a learner, you are continually looking to keep up in class to avert getting engulfed by topics. As guardians, you are continually searching for ways how to motivate your children to succeed in academics and beyond.

It’s particularly critical to keep the pace in mathematics due to the fact that the theories always build on themselves. If you don’t comprehend a particular topic, it may hurt you in future lessons. Comprehending y-intercepts is the best example of topics that you will work on in mathematics time and time again

Let’s check out the fundamentals regarding the y-intercept and let us take you through some handy tips for solving it. If you're a math whiz or beginner, this preface will enable you with all the knowledge and instruments you require to dive into linear equations. Let's get into it!

What Is the Y-intercept?

To entirely understand the y-intercept, let's think of a coordinate plane.

In a coordinate plane, two perpendicular lines intersect at a point known as the origin. This junction is where the x-axis and y-axis link. This means that the y value is 0, and the x value is 0. The coordinates are stated like this: (0,0).

The x-axis is the horizontal line passing across, and the y-axis is the vertical line traveling up and down. Every axis is numbered so that we can specific points on the plane. The counting on the x-axis increase as we drive to the right of the origin, and the values on the y-axis grow as we move up from the origin.

Now that we have gone over the coordinate plane, we can specify the y-intercept.

Meaning of the Y-Intercept

The y-intercept can be considered as the starting point in a linear equation. It is the y-coordinate at which the coordinates of that equation crosses the y-axis. Simply put, it portrays the number that y takes when x equals zero. Next, we will illustrate a real-life example.

Example of the Y-Intercept

Let's suppose you are driving on a long stretch of track with a single path runnin in both direction. If you begin at point 0, where you are sitting in your car this instance, then your y-intercept will be similar to 0 – given that you haven't moved yet!

As you initiate driving down the road and picking up momentum, your y-intercept will rise before it archives some higher number when you arrive at a designated location or halt to induce a turn. Thus, when the y-intercept might not appear typically relevant at first glance, it can offer details into how objects change over time and space as we shift through our world.

Therefore,— if you're ever puzzled trying to understand this concept, remember that just about everything starts somewhere—even your travel down that long stretch of road!

How to Find the y-intercept of a Line

Let's think regarding how we can discover this value. To support you with the process, we will outline a some steps to do so. Thereafter, we will offer some examples to show you the process.

Steps to Find the y-intercept

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

1. Search for the equation of the line in slope-intercept form (We will go into details on this afterwards in this article), that should appear something like this: y = mx + b

2. Plug in 0 for x

3. Solve for y

Now that we have gone over the steps, let's take a look how this procedure will function with an example equation.

Example 1

Locate the y-intercept of the line described by the equation: y = 2x + 3

In this example, we can replace in 0 for x and solve for y to locate that the y-intercept is equal to 3. Therefore, we can conclude that the line goes through the y-axis at the point (0,3).

Example 2

As one more example, let's consider the equation y = -5x + 2. In this case, if we replace in 0 for x once again and work out y, we find that the y-intercept is equal to 2. Thus, the line intersects the y-axis at the coordinate (0,2).

What Is the Slope-Intercept Form?

The slope-intercept form is a method of representing linear equations. It is the cost common kind employed to convey a straight line in scientific and mathematical uses.

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

As we checked in the last portion, the y-intercept is the coordinate where the line goes through the y-axis. The slope‌ is a measure of angle the line is. It is the unit of change in y regarding x, or how much y shifts for every unit that x changes.

Considering we have revised the slope-intercept form, let's observe how we can utilize it to discover the y-intercept of a line or a graph.


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

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

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

y = (-2*1) + 5

y = 3

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

Grade Potential Can Support You with the y-intercept

You will revise the XY axis over and over again during your science and math studies. Concepts will get more complicated as you progress from working on a linear equation to a quadratic function.

The time to peak your understanding of y-intercepts is now before you lag behind. Grade Potential gives expert instructors that will support you practice solving the y-intercept. Their tailor-made explanations and practice problems will make a good difference in the results of your test scores.

Whenever you feel stuck or lost, Grade Potential is here to guide!