Linear Equation Unknown Variable Calculator, Formula & Example Calculation
 

Linear interpolation calculator  step by step calculation, formula & solved example to find the linear equation unknown variable in the XY coordinate system or plane. It's an online geometry tool find the missing linear interpolation value lies between to known variables or rates. The line coordinates (x_{1}, y_{1}), (x_{2}, y_{2}) & (x_{3}, y_{3}) in the XY plane are used in this calculator to find out the point slope form of a line unknown value of a linear equation, which lies between the two known variables.
Linear interpolation
It's a method of curve fitting using linear equation, calculates the linear equation unknown variable as if it lies between two known polynomials or variables on a straight line. Linear Interpolation is a simplest way to find out the unknown or missing variable in a linear equation. Such calculations are deeply employed numerous applications including computer graphics and particularly numerical analysis in mathematics. It is a simple form of interpolation.
Formula
Linear interpolation to find the unknown variable on a XY coordinate system or plane mathematically represented by the below formula
Solved Example
This below solved example let users to understand how the example values are being used in this calculation to find the unknown variable of a linear equation.
Problem:
Find the unknown variable y_{2} where the values of x_{1} = 5, x_{2} = 7, x_{3} = 9, y_{1} = 12 & y_{3} = 15.
Solution:
Given
_{1} = 5, x_{2} = 7, x_{3} = 9,
y_{1} = 12 & y_{3} = 15
y_{2} = ?
Apply the values in the y_{2} equation
y_{2} = ((x_{2}  x_{1})(y_{3}  y_{1}) / (x_{3}  x_{1})) + y_{1}
= ((7  5) * (15  12)/(9  5)) + 12
= ((2 * 3)/4) + 12
y_{2} = 13.5
This step by step calculation, formula & solved example to find the unknown variable of a linear equation on XY plane may help users to understand, practice and perform linear interpolation calculations. When it comes to online for quick calculations, this linear interpolation calculator may help the user to perform & verify the results of such calculations.
Similar Resource 
Cramer's Rule Formula for Linear Equation 
How to Solve 3 Variable Linear Equations 
Quadratic Equation Worksheet 
Heron Formula for Area of Triangle 