November 11, 2022

Y-Intercept - Definition, Examples

As a student, you are constantly working to keep up in school to prevent getting engulfed by topics. As parents, you are continually searching for ways how to encourage your kids to prosper in academics and beyond.

It’s especially important to keep the pace in mathematics because the concepts continually founded on themselves. If you don’t comprehend a particular lesson, it may haunt you for months to come. Understanding y-intercepts is the best example of topics that you will revisit in mathematics over and over again

Let’s check out the basics about y-intercept and take a look at some tips and tricks for solving it. Whether you're a mathematical whiz or beginner, this preface will provide you with all the information and instruments you require to dive into linear equations. Let's dive right in!

What Is the Y-intercept?

To completely understand the y-intercept, let's imagine a coordinate plane.

In a coordinate plane, two perpendicular lines intersect at a point called the origin. This junction is where the x-axis and y-axis join. 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 traveling up and down. Every axis is counted so that we can identify a points along the axis. The numbers on the x-axis rise as we move to the right of the origin, and the values on the y-axis increase as we shift 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 thought of as the starting point in a linear equation. It is the y-coordinate at which the graph of that equation overlaps the y-axis. In other words, it portrays the value that y takes once x equals zero. Further ahead, we will explain a real-world example.

Example of the Y-Intercept

Let's imagine you are driving on a straight track with one path runnin in respective direction. If you begin at point 0, location you are sitting in your vehicle right now, then your y-intercept would be equal to 0 – considering you haven't shifted yet!

As you start driving down the road and picking up momentum, your y-intercept will increase before it archives some greater value once you reach at a designated location or halt to induce a turn. Therefore, once the y-intercept may not look especially important at first sight, it can provide insight into how objects change over time and space as we travel through our world.

Hence,— if you're at any time stranded attempting to get a grasp of this concept, bear in mind that almost everything starts somewhere—even your trip through that straight road!

How to Discover the y-intercept of a Line

Let's comprehend about how we can find this number. To guide with the procedure, we will create a summary of a few steps to do so. Next, we will provide some examples to show you the process.

Steps to Discover the y-intercept

The steps to discover a line that goes through 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. Put 0 as the value of x

3. Solve for y

Now once we have gone through the steps, let's see how this method will work with an example equation.

Example 1

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

In this example, we can replace in 0 for x and figure out y to discover that the y-intercept is equal to 3. Thus, we can conclude 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 such a case, if we place in 0 for x once again and figure out y, we discover that the y-intercept is equal to 2. Therefore, the line goes through the y-axis at the point (0,2).

What Is the Slope-Intercept Form?

The slope-intercept form is a procedure of depicting linear equations. It is the commonest kind employed to represent a straight line in mathematical and scientific 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 previous portion, the y-intercept is the point where the line intersects 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 shifts for every unit that x changes.

Now that we have went through the slope-intercept form, let's see how we can use it to find the y-intercept of a line or a graph.


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

In this instance, we can see that m = -2 and b = 5. Thus, the y-intercept is equal to 5. Therefore, we can conclude that the line crosses the y-axis at the coordinate (0,5).

We can 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 work out:

y = (-2*1) + 5

y = 3

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

Grade Potential Can Support You with the y-intercept

You will revise the XY axis over and over again across your math and science studies. Ideas will get more complicated as you move from working on a linear equation to a quadratic function.

The time to master your understanding of y-intercepts is now before you fall behind. Grade Potential offers experienced instructors that will support you practice finding the y-intercept. Their customized interpretations and solve problems will make a positive distinction in the results of your examination scores.

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