Incorrect spelling, explanation: suffixes *-sion* and *-tion* are often confused, but there are some rules which can help us to distinguish them. One such rule is, that when the verb ends with the suffix *-ate*, then its noun form ends with *-tion*. This is exactly what happens with **equation**: the verb form is *to equate*, so we should use the suffix *-tion*. This also explains why ~~equasion~~ is incorrect.

Correct spelling, explanation: **equation** is the correct spelling because the verb *to equate* points to *-tion* suffix. This is due to the fact, that there are two suffixes that are often confused: *-sion* and *-tion*. According to one of the rules verbs that end with *-ate* (as in *equate*) end with *-tion* when transformed into nouns. Therefore **equation** is the correct form and ~~equasion~~ is incorrect.

**Definition of equation:**

noun, in mathematics: a formula in which two expressions are equal; also: a complicated situation

*Another important factor in the*

**equation**is the interest rate.*In*

**equation**3x – 2 = 4, x equals 2.**Collocations with equation:**

basic / simple

**equation**

*The formula for finding the volume of a sphere is a basic*

**equation**in geometry.complex / complicated

**equation**

*The Navier-Stokes*

**equations**describe fluid dynamics and can be a complicated**equation**to solve.solve / work our an

**equation**

*In order to find the value of x, you need to solve an*

**equation**.**equation**for

*The*

**equation**for calculating the force of gravity between two objects is a fundamental concept in physics.come into an

**equation**

*Environmental factors such as temperature and humidity come into an*

**equation**when calculating air pressure.Incorrect spelling

Incorrect spelling

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