November 11, 2022

Y-Intercept - Explanation, Examples

As a learner, you are constantly looking to keep up in school to prevent getting swamped by topics. As guardians, you are always searching for ways how to motivate your kids to prosper in academics and after that.

It’s especially important to keep the pace in mathematics due to the fact that the theories constantly founded on themselves. If you don’t understand a specific topic, it may haunt you for months to come. Comprehending y-intercepts is a perfect example of theories that you will use in mathematics repeatedly

Let’s look at the basics about y-intercept and let us take you through some in and out for working with it. If you're a mathematical wizard or novice, this introduction will provide 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 completely comprehend 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 section 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 written like this: (0,0).

The x-axis is the horizontal line traveling across, and the y-axis is the vertical line going up and down. Every single axis is numbered so that we can specific points along the axis. The numbers on the x-axis grow as we shift to the right of the origin, and the numbers 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 considered as the starting point in a linear equation. It is the y-coordinate at which the graph of that equation overlaps the y-axis. Simply said, it portrays the value that y takes once x equals zero. After this, we will illustrate a real-world example.

Example of the Y-Intercept

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

As you begin traveling down the road and picking up speed, your y-intercept will increase before it reaches some greater value when you arrive at a destination or halt to induce a turn. Consequently, while the y-intercept might not look typically important at first look, it can offer knowledge into how things transform eventually and space as we shift through our world.

Hence,— if you're at any time stuck trying to comprehend this concept, remember that almost everything starts somewhere—even your travel down that straight road!

How to Locate the y-intercept of a Line

Let's consider regarding how we can find this number. To support you with the process, we will outline a some steps to do so. Then, we will provide some examples to illustrate the process.

Steps to Find the y-intercept

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

1. Find the equation of the line in slope-intercept form (We will dive into details on this afterwards in this article), that should appear as same as this: y = mx + b

2. Replace 0 in place of x

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

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

In this instance, we can plug in 0 for x and figure out y to locate that the y-intercept is equal to 3. Thus, we can state that the line crosses the y-axis at the coordinates (0,3).

Example 2

As one more example, let's take the equation y = -5x + 2. In this instance, if we replace in 0 for x once again and work out y, we discover 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 way of representing linear equations. It is the most popular form utilized to express a straight line in mathematical and scientific 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 previous section, the y-intercept is the point where the line crosses the y-axis. The slope‌ is a measure of how steep the line is. It is the rate of shifts in y regarding x, or how much y moves for each unit that x shifts.

Since we have reviewed the slope-intercept form, let's observe how we can employ it to find 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. 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 can take it a step further to illustrate the angle of the line. Based on the equation, we know the slope is -2. Place 1 for x and calculate:

y = (-2*1) + 5

y = 3

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

Grade Potential Can Guidance You with the y-intercept

You will review the XY axis time and time again during your math and science studies. Ideas will get more difficult 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 fall behind. Grade Potential provides experienced teacher that will help you practice finding the y-intercept. Their tailor-made interpretations and practice problems will make a positive distinction in the outcomes of your examination scores.

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