Incorrect spelling, explanation: ~~equasion~~ is incorrect because in this case, we should use the suffix *-tion*, not *-sion*. These two suffixes are often mistaken, but the reason behind **equation** being correct is easy to remember. We use the noun suffix *-tion* when the verb ends with *-ate*. The verb form of this word is *equate*, so **equation** is the correct form.

Correct spelling, explanation: *-sion* and *-tion* are commonly mistaken suffixes, which are really two options of the same suffix *-ion*. There are some rules to when use each of these, and in the case of **equation**, the reason is pretty simple – one of the rules state that *-tion* is used with verbs ending with *-ate*. The verb here is *to equate*, so **equation** is the correct form. Moreover, the word comes from French **équation**, which is from Latin *aequationem*. As you can see both origins use *t* not *s* in spelling. Therefore **equation** is the correct form and ~~equasion~~ is a mistake.

**Definition of equation:**

noun, a mathematical statement where two expressions are equal; also: a complicated situation

*In the*

**equation**2x – 4 = 20, x equals 12.*The profit here can be calculated with a simple*

**equation**.**Collocations with equation:**

basic / simple

**equation**

*The formula for finding the area of a rectangle is a simple*

**equation**.complex / complicated

**equation**

*Solving Einstein’s theory of general relativity involves a complex*

**equation**.solve / work out an

**equation**

*I need to work out an*

**equation**to calculate the monthly mortgage payment.**equation**for

*The*

**equation**for determining the speed of light is a famous example in physics.come into an

**equation**

*Economic factors such as inflation and interest rates come into an*

**equation**when calculating the future value of an investment.Incorrect spelling

Incorrect spelling

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Both are correct, you wrong