How to Find x and y Intercept of a Parabola

How to Find y Intercept of a Function

Last Updated : 23 Aug, 2024

To find the y-intercept of a function, set x = 0 and solve for y. The y-intercept is the point where the function crosses the y-axis, given as (0, y). For example, in y = mx + b, the y-intercept is b.

What is y-Intercept?

The y-intercept is the point where a graph intersects the y-axis. It represents the value of y when x is 0 in the function's equation. Mathematically, it’s the coordinate (0, y), showing where the line or curve crosses the y-axis.

Steps to Find y Intercept of a Function

To find the y-intercept of a function, you need to determine the point where the graph of the function crosses the y-axis. This occurs when the x-value is zero.

Here's how you can find the y-intercept:

Step 1: Set x = 0 in the function.
Substitute x = 0 into the function's equation.
Step 2: Solve for y.
After substituting x = 0, solve the equation to find the corresponding y-value. This y-value is the y-intercept.

Example of y Intercept of a Function

Example: Find the y-intercept of function f(x) = 2x + 3.

Solution:

Set x = 0: f(0) = 2(0) + 3
Solve for y: f(0) = 3So, the y-intercept is 3.

The y-intercept is the point (0, 3) on the graph.

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Conclusion

Finding the y-intercept of a function involves setting x=0 and solving for the y. This point is where the function intersects the y-axis. Understanding how to the determine the y-intercept is fundamental in the graphing functions and analyzing their behavior. It provides insight into the initial value of the function when x is zero in which can be crucial for the interpreting the function's graph and solving the real-world problems. The Mastering this concept enhances the ability to analyze and work with the various types of the functions effectively.

How to Find x and y Intercept of a Parabola

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