College Math CLEP Prep Practice Exam

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Which of these is NOT an equation of a line?

y = mx
x+y=4
y=3
2x-5y=7

The correct answer is: x+y=4

An equation of a line must include a variable raised to the first power. The options A and C both include a variable y raised to the first power, which makes them valid equations of a line. Option D also includes a variable x raised to the first power. However, option B does not feature any variables raised to the first power and is therefore not an equation of a line.