which of these is an example of a literal equation?
a. 2x + 7y
b. ax - by = k
c. 4x + 7 = 22
d. 5 + 20 = 5^2

B.

Step-by-step explanation:

We know that,

Literal equation is an equation having atleast two variables which represents the real values.

So, according to the options, we have,

A.

Though it contains two variables, it is not a literal equation as it is just an expression and not an equation.

C.

Since, it contains only one variable and a literal equation needs atleast two variables.

So, it is not a literal equation.

D.

Since, it does not contain any variable and a literal equation needs atleast two variables.

So, it is not a literal equation.

Finally, we see that,

B.

This equation consists of two variables x, y which represents any real value.

Thus, it is a literal equation.

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step-by-step explanation: