November 11, 2022

Y-Intercept - Definition, Examples

As a learner, you are continually seeking to keep up in school to prevent getting engulfed by topics. As parents, you are constantly searching for ways how to encourage your kids to prosper in school and after that.

It’s specifically critical to keep the pace in math due to the fact that the concepts constantly founded on themselves. If you don’t comprehend a specific topic, it may haunt you in future lessons. Comprehending y-intercepts is the best example of topics that you will revisit in math repeatedly

Let’s look at the basics regarding the y-intercept and show you some tips and tricks for solving it. Whether you're a mathematical whiz or beginner, this preface will enable you with all the knowledge and instruments you require to tackle linear equations. Let's jump directly to it!

What Is the Y-intercept?

To fully grasp the y-intercept, let's picture a coordinate plane.

In a coordinate plane, two perpendicular lines intersect at a section known as 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 stated like this: (0,0).

The x-axis is the horizontal line traveling across, and the y-axis is the vertical line traveling up and down. Every single axis is counted so that we can locate points on the plane. The vales on the x-axis grow as we shift to the right of the origin, and the numbers on the y-axis rise as we drive up from 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 considered as the initial point in a linear equation. It is the y-coordinate at which the coordinates of that equation crosses the y-axis. In other words, it portrays the value that y takes when x equals zero. After this, we will illustrate a real-life example.

Example of the Y-Intercept

Let's suppose you are driving on a straight highway with one path runnin in both direction. If you begin at point 0, location you are sitting in your car this instance, therefore your y-intercept would be equal to 0 – given that you haven't shifted yet!

As you start driving down the track and started gaining speed, your y-intercept will increase until it archives some higher value once you arrive at a designated location or stop to make a turn. Therefore, once the y-intercept might not appear typically relevant at first look, it can offer insight into how things change eventually and space as we travel through our world.

Hence,— if you're ever puzzled trying to comprehend this concept, keep in mind that nearly everything starts somewhere—even your travel down that straight road!

How to Locate the y-intercept of a Line

Let's consider about how we can find this number. To guide with the procedure, we will create a summary of a some steps to do so. Then, we will give you some examples to demonstrate the process.

Steps to Find the y-intercept

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

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

2. Substitute the value of x with 0

3. Calculate the value of y

Now that we have gone over the steps, let's check out how this method will function with an example equation.

Example 1

Locate the y-intercept of the line portrayed by the formula: y = 2x + 3

In this example, we can plug in 0 for x and work out y to find that the y-intercept is the value 3. Thus, we can conclude that the line crosses the y-axis at the point (0,3).

Example 2

As additional example, let's take the equation y = -5x + 2. In this case, if we substitute in 0 for x yet again and solve for y, we find that the y-intercept is equal to 2. Thus, the line crosses the y-axis at the coordinate (0,2).

What Is the Slope-Intercept Form?

The slope-intercept form is a way of depicting linear equations. It is the most popular kind used to express a straight line in mathematical and scientific uses.

The slope-intercept formula 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 previous portion, the y-intercept is the coordinate where the line crosses the y-axis. The slope‌ is a scale of the inclination the line is. It is the rate of shifts in y regarding x, or how much y moves for every unit that x changes.

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


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

In this instance, we can observe that m = -2 and b = 5. Therefore, the y-intercept is equal to 5. Consequently, we can say that the line intersects the y-axis at the coordinate (0,5).

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

y = (-2*1) + 5

y = 3

The answer 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 repeatedly throughout your math and science studies. Theories will get more complicated as you progress from working on a linear equation to a quadratic function.

The moment to master your grasp of y-intercepts is now before you lag behind. Grade Potential gives experienced instructors that will help you practice finding the y-intercept. Their personalized interpretations and solve problems will make a positive difference in the outcomes of your examination scores.

Whenever you believe you’re stuck or lost, Grade Potential is here to assist!