November 11, 2022

Y-Intercept - Explanation, Examples

As a student, you are always seeking to keep up in school to avoid getting overwhelmed by subjects. As parents, you are constantly searching for ways how to encourage your kids to be successful in academics and after that.

It’s particularly essential to keep the pace in math because the theories always founded on themselves. If you don’t understand a particular lesson, it may hurt you in future lessons. Comprehending y-intercepts is an ideal example of theories that you will revisit in mathematics over and over again

Let’s go through the foundation ideas regarding the y-intercept and take a look at some tips and tricks for solving it. If you're a mathematical wizard or novice, this preface will equip you with all the things you need to learn and instruments you need to get into linear equations. Let's get into it!

What Is the Y-intercept?

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

In a coordinate plane, two straight lines intersect at a junction called the origin. This point is where the x-axis and y-axis link. 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 traveling up and down. Each axis is numbered so that we can identify a points on the plane. The numbers on the x-axis increase as we move to the right of the origin, and the numbers on the y-axis grow as we drive up along 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 taken into account as the initial 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 signifies the number that y takes once x equals zero. After this, we will show you a real-life example.

Example of the Y-Intercept

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

As you begin driving down the road and picking up speed, your y-intercept will increase before it reaches some higher number when you arrive at a designated location or halt to make a turn. Thus, when the y-intercept might not seem typically important at first glance, it can offer details into how objects change over time and space as we travel through our world.

So,— if you're ever stuck trying to comprehend this concept, keep in mind that nearly everything starts somewhere—even your trip through that long stretch of road!

How to Find the y-intercept of a Line

Let's comprehend regarding how we can discover this number. To help with the procedure, we will outline a some steps to do so. Thereafter, we will provide some examples to show you the process.

Steps to Find the y-intercept

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

1. Find the equation of the line in slope-intercept form (We will expand on this afterwards in this article), which should appear something like this: y = mx + b

2. Put 0 as the value of x

3. Work out y

Now that we have gone through the steps, let's check out how this method would function with an example equation.

Example 1

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

In this example, we can replace in 0 for x and solve for y to find that the y-intercept is equal to 3. Consequently, we can conclude 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 such a case, if we substitute in 0 for x once again and figure out y, we get that the y-intercept is equal to 2. Consequently, the line crosses 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 employed to depict a straight line in scientific and mathematical subjects.

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 went through in the previous section, the y-intercept is the coordinate where the line goes through 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 shifts for every unit that x changes.

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


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

In this equation, we can observe that m = -2 and b = 5. Therefore, the y-intercept is equal to 5. Thus, we can conclude that the line intersects 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. Plug 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 replaced by 1 unit, y changed by -2 units.

Grade Potential Can Guidance You with the y-intercept

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

The moment to peak your comprehending of y-intercepts is now prior you fall behind. Grade Potential gives experienced instructors that will guide you practice finding the y-intercept. Their personalized explanations and solve questions will make a positive difference in the results of your examination scores.

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