Last updated on August 2nd, 2025
Linear interpolation is a mathematical method used to estimate values between two known values in a data set. It is commonly used in statistics, science, and engineering. In this topic, we will learn the formula for linear interpolation and how to apply it.
Linear interpolation is a method for estimating unknown values that fall within the range of two known values. Let's learn the formula for linear interpolation and how it can be applied in various contexts.
The linear interpolation formula is used to find an estimated value, (y), based on two known values, ((x0, y0)) and ((x1, y1)).
The formula is: [ y = y0 + frac{(x1 - x0)(y1 - y0)}{x1 - x0} ] where (x) is the point at which you want to interpolate the value.
In mathematics and various fields, linear interpolation is used to approximate unknown values that fall within the range of two known points.
Here are some reasons why the linear interpolation formula is important:
Students often find math formulas tricky and confusing.
Here are some tips and tricks to master the linear interpolation formula:
Linear interpolation is widely used in real-life applications to estimate values within a range.
Here are some examples:
Students often make errors when applying the linear interpolation formula. Here are some common mistakes and ways to avoid them:
Estimate the value of \(y\) at \(x = 4\) if the points are \((2, 3)\) and \((6, 7)\).
The estimated value of \(y\) is 5.
Using the formula: y = 3 + frac{(4 - 2)(7 - 3)}{6 - 2}
= 3 + frac{2 × 4}{4}
= 3 + 2
= 5
Find the interpolated value at \(x = 5\) for the points \((3, 9)\) and \((7, 13)\).
The interpolated value is 11.
Using the formula: y = 9 + frac{(5 - 3)(13 - 9)}{7 - 3}
= 9 + frac{2 × 4}{4}
= 9 + 2
= 11
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