grammar (freeCodeCamp#31569)

change 'a' to 'an' before the word <inverse>
saranshkataria · Jan 21, 2019 · b862a0f · b862a0f
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diff --git a/guide/english/mathematics/intro-to-inverse-functions/index.md b/guide/english/mathematics/intro-to-inverse-functions/index.md
@@ -3,7 +3,7 @@ title: Intro to Inverse Functions
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 ## Intro to Inverse Functions
 
-Say you were trying to reflect y=3x over the line y=x. What would be the equation of the line? As you can see in the image below, it would be y=1/3x. But why is that so? If you swap x and y with each other and solve for y, you can find that the equation would be the same. This is what would be called a inverse function.
+Say you were trying to reflect y=3x over the line y=x. What would be the equation of the line? As you can see in the image below, it would be y=1/3x. But why is that so? If you swap x and y with each other and solve for y, you can find that the equation would be the same. This is what would be called an inverse function.
 
 <img src="http://d2r5da613aq50s.cloudfront.net/wp-content/uploads/369430.image1.jpg" />