College Math CLEP Prep Practice Exam

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Which of the following is an example of a linear equation?

y = x^2
y = sqrt(x)
y = 2x + 5
y = 4x^2 + 3x

The correct answer is: y = 2x + 5

A linear equation is a mathematical equation that can be written in the form y = mx + b, where m and b are constants. Option A is a quadratic equation with a degree of 2, meaning it has an x^2 term. Option B is a square root function, which does not have a linear form. Option D is also a quadratic equation, but with an additional x term, making it non-linear. Therefore, C is the only option that follows the form of a linear equation and is therefore the correct answer.