November 11, 2022

Y-Intercept - Explanation, Examples

As a student, you are always working to keep up in class to prevent getting swamped by topics. As parents, you are always investigating how to support your kids to be successful in school and furthermore.

It’s specifically important to keep up in math due to the fact that the concepts constantly build on themselves. If you don’t understand a specific topic, it may plague you in future lessons. Understanding y-intercepts is an ideal example of something that you will revisit in math over and over again

Let’s check out the basics regarding the y-intercept and let us take you through some handy tips for solving it. If you're a mathematical whiz or novice, this preface will equip you with all the knowledge and instruments you need to tackle linear equations. Let's dive right in!

What Is the Y-intercept?

To entirely comprehend the y-intercept, let's imagine a coordinate plane.

In a coordinate plane, two straight lines intersect at a point 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 noted 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. Each axis is counted so that we can identify a points along the axis. The numbers on the x-axis grow as we move to the right of the origin, and the numbers on the y-axis grow as we move 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 number that y takes once x equals zero. Next, we will explain a real-life example.

Example of the Y-Intercept

Let's assume you are driving on a long stretch of road with one lane going in respective direction. If you start at point 0, where you are sitting in your car this instance, then your y-intercept will be equivalent to 0 – since you haven't shifted yet!

As you initiate traveling down the track and picking up speed, your y-intercept will increase until it reaches some greater number once you reach at a designated location or halt to make a turn. Thus, when the y-intercept might not appear especially applicable at first look, it can offer knowledge into how things transform over a period of time and space as we shift through our world.

Hence,— if you're ever stranded attempting to comprehend this concept, remember that nearly everything starts somewhere—even your travel down that long stretch of road!

How to Find the y-intercept of a Line

Let's comprehend about how we can discover this value. To support you with the process, we will create a summary of a handful of steps to do so. Thereafter, we will provide some examples to illustrate the process.

Steps to Locate the y-intercept

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

1. Locate the equation of the line in slope-intercept form (We will go into details on this afterwards in this article), which should appear similar this: y = mx + b

2. Replace 0 in place of x

3. Work out y

Now once we have gone through the steps, let's take a look how this procedure would function with an example equation.

Example 1

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

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

Example 2

As additional example, let's consider the equation y = -5x + 2. In this instance, if we plug in 0 for x one more time and solve for y, we discover that the y-intercept is equal to 2. Thus, the line goes through the y-axis at the coordinate (0,2).

What Is the Slope-Intercept Form?

The slope-intercept form is a method of depicting linear equations. It is the commonest form utilized to depict a straight line in mathematical and scientific subjects.

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 last section, the y-intercept is the coordinate where the line crosses the y-axis. The slope‌ is a measure of how steep the line is. It is the unit of change in y regarding x, or how much y moves for every unit that x shifts.

Now that we have revised the slope-intercept form, let's see how we can use 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. Therefore, the y-intercept is equal to 5. Thus, we can conclude that the line goes through the y-axis at the point (0,5).

We could take it a step higher to explain 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 Support You with the y-intercept

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

The moment to peak your comprehending of y-intercepts is now before you straggle. Grade Potential provides expert instructors that will support you practice solving the y-intercept. Their customized interpretations and work out questions will make a good difference in the outcomes of your exam scores.

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