State whether given pairs of terms are like or unlike terms.
$- 10 x, - 20 y$

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Solution

Terms which are having the same variables that are raised to the same power are called the like terms. They may differ in their numerical coefficient.
Whereas the terms which do not have the same variables are unlike terms.
The given pairs of terms are $- 10 x, - 20 y$
The term $- 10 x$ has a variable $x$
and the term $- 20 y$ has a variable $y$
Since variables are not the same.
Hence, the given pairs of terms are unlike terms

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