Consider the following equations and choose the correct alternative.
2x + y = 5
5b - 2 = 3

x and y are variables

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x and y are unknowns

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b is an unknown

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b is a variable

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Solution

The correct options are
A x and y are variables
C b is an unknown
In the equation 2x + y = 5, x and y are variables as their values are not fixed. For example, if x = 1, y = 3, else if x = 2, y = 1.
In the equation 5b - 2 = 3, the value of b is 1 which is a fixed value. Hence, it is an unknown.

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