November 11, 2022

Y-Intercept - Definition, Examples

As a student, you are constantly looking to keep up in class to avoid getting overwhelmed by subjects. As parents, you are continually searching for ways how to motivate your kids to prosper in school and furthermore.

It’s especially essential to keep up in math reason being the theories continually build on themselves. If you don’t comprehend a specific lesson, it may hurt you in future lessons. Understanding y-intercepts is the best example of topics that you will work on in math repeatedly

Let’s look at the fundamentals about y-intercept and let us take you through some tips and tricks for solving it. If you're a math wizard or just starting, this introduction will equip you with all the knowledge and tools you need to tackle linear equations. Let's get into it!

What Is the Y-intercept?

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

In a coordinate plane, two perpendicular lines intersect at a section called 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 going through, and the y-axis is the vertical line traveling up and down. Every axis is counted so that we can specific points on the plane. The vales on the x-axis rise as we drive to the right of the origin, and the values on the y-axis rise as we drive 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 initial point in a linear equation. It is the y-coordinate at which the coordinates of that equation intersects the y-axis. Simply put, it represents the value that y takes once x equals zero. Further ahead, we will illustrate a real-world example.

Example of the Y-Intercept

Let's imagine you are driving on a straight track with a single path going in both direction. If you start at point 0, location you are sitting in your vehicle right now, therefore your y-intercept will be similar to 0 – considering you haven't moved yet!

As you initiate you are going the road and started gaining momentum, your y-intercept will rise before it archives some greater number once you reach at a destination or halt to make a turn. Therefore, while the y-intercept might not appear typically important at first sight, it can give insight into how objects transform eventually and space as we shift through our world.

So,— if you're always stuck attempting to comprehend this theory, remember that almost everything starts somewhere—even your trip down that long stretch of road!

How to Find the y-intercept of a Line

Let's consider regarding how we can find this value. To help with the method, we will make a synopsis of handful of steps to do so. Next, we will offer some examples to demonstrate the process.

Steps to Locate the y-intercept

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

1. Search for 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. Work out y

Now once we have gone over the steps, let's see how this method would function with an example equation.

Example 1

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

In this example, we can replace in 0 for x and figure out y to find that the y-intercept is the value 3. Consequently, we can conclude that the line intersects the y-axis at the coordinates (0,3).

Example 2

As additional example, let's assume the equation y = -5x + 2. In this case, if we place in 0 for x once again and solve for y, we discover that the y-intercept is equal to 2. Consequently, 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 cost common form used to express a straight line in scientific and mathematical uses.

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 checked in the last 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 unit of shifts in y regarding x, or how much y shifts for every unit that x shifts.

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


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

In this equation, we can observe that m = -2 and b = 5. Consequently, the y-intercept is equal to 5. Consequently, we can conclude that the line goes through the y-axis at the coordinate (0,5).

We could take it a step further to depict the slope of the line. Founded on the equation, we know the inclination is -2. Place 1 for x and calculate:

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 Guidance You with the y-intercept

You will revisit the XY axis repeatedly across your math and science studies. Theories will get more difficult as you progress from working on a linear equation to a quadratic function.

The moment to master your understanding of y-intercepts is now prior you lag behind. Grade Potential offers expert instructors that will guide you practice solving the y-intercept. Their tailor-made interpretations and work out problems will make a good distinction in the outcomes of your exam scores.

Anytime you feel stuck or lost, Grade Potential is here to help!