Verified answer

Answer:

C.

Explanation:

A one-variable linear equation is an equation that has at most one linear equation, This is in the form ax + b = 0. Where x is a variable.

A. 2mn + 45 = 0

• This is not a one-variable linear equation because there are two variables

B. 2x + 3y = 56

• This is not a one-variable linear equation because there are two variables x and y

C .2x + 5 = 18

• This is a linear equation in one variable.

D 10abc = 190a

• This is not a one-variable linear equation because there are two variables b and c.

Therefore, C is the answer.

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