Justin's age is 5 years.
What is linear equation in one variable?
The linear equations in one variable is an equation which is expressed in the form of ax + b = 0, where a and b are two integers, and x is a variable and has only one solution.
According to the given question
Justin is 2 years older than 1/4 of his brother's age.
Let the age of Justin be x years.
Also, Justin's brother age is 12 years.
Therefore,
The age pf Justin is given by
[tex]x = 2 + \frac{1}{4}(12)[/tex]
solve the above linear equation
⇒ x = 2 + 3
⇒ x = 5 years
Hence, Justin's age is 5 years.
Learn more about linear equation here:
https://brainly.com/question/17139602
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