November 11, 2022

Y-Intercept - Definition, Examples

As a student, you are constantly working to keep up in school to prevent getting engulfed by subjects. As parents, you are constantly investigating how to motivate your kids to be successful in academics and after that.

It’s especially critical to keep the pace in mathematics due to the fact that the theories continually founded on themselves. If you don’t grasp a particular topic, it may haunt you in next lessons. Understanding y-intercepts is a perfect example of something that you will work on in math over and over again

Let’s check out the foundation ideas about y-intercept and take a look at some handy tips for working with it. If you're a mathematical wizard or novice, this preface will provide you with all the knowledge and instruments you need to dive into linear equations. Let's jump directly to it!

What Is the Y-intercept?

To fully comprehend 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 point 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 across, and the y-axis is the vertical line traveling up and down. Each axis is counted so that we can identify a points on the plane. The counting on the x-axis rise as we drive to the right of the origin, and the values on the y-axis grow as we drive up from the origin.

Now that we have revised the coordinate plane, we can determine 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 graph of that equation crosses the y-axis. In other words, it portrays the value that y takes once 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 road with a single path going in both direction. If you start at point 0, where you are sitting in your vehicle this instance, subsequently your y-intercept will be equal to 0 – since you haven't shifted yet!

As you begin driving down the road and started gaining speed, your y-intercept will rise before it reaches some greater value when you reach at a destination or stop to make a turn. Thus, when the y-intercept may not appear typically relevant at first sight, it can provide insight into how objects transform over a period of time and space as we shift through our world.

Hence,— if you're ever puzzled trying to comprehend this concept, remember that just about everything starts somewhere—even your trip through that straight road!

How to Find the y-intercept of a Line

Let's think regarding how we can discover this number. To help with the process, we will make a synopsis of few steps to do so. Then, we will provide some examples to illustrate the process.

Steps to Locate the y-intercept

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

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

2. Substitute the value of x with 0

3. Work out y

Now once we have gone over the steps, let's check out how this procedure will work with an example equation.

Example 1

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

In this example, we could replace in 0 for x and solve for y to find that the y-intercept is the value 3. Therefore, we can say that the line goes through the y-axis at the coordinates (0,3).

Example 2

As one more example, let's consider the equation y = -5x + 2. In this case, if we substitute in 0 for x one more time and solve for y, we get that the y-intercept is equal to 2. Therefore, the line intersects the y-axis at the point (0,2).

What Is the Slope-Intercept Form?

The slope-intercept form is a procedure of representing linear equations. It is the cost common form used to represent a straight line in mathematical and scientific applications.

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 saw in the previous section, the y-intercept is the point where the line crosses the y-axis. The slope‌ is a scale of the inclination the line is. It is the unit of shifts in y regarding x, or how much y changes for each unit that x changes.

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


Discover 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. Consequently, the y-intercept is equal to 5. Thus, we can conclude that the line intersects the y-axis at the point (0,5).

We could take it a step higher to depict the inclination of the line. Founded on the equation, we know the slope is -2. Replace 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 changed by 1 unit, y replaced by -2 units.

Grade Potential Can Guidance You with the y-intercept

You will review the XY axis repeatedly across your math and science studies. Concepts will get more complicated as you progress from solving a linear equation to a quadratic function.

The time to peak your comprehending of y-intercepts is now prior you lag behind. Grade Potential gives experienced tutors that will help you practice finding the y-intercept. Their personalized interpretations and practice problems will make a positive difference in the results of your examination scores.

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