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Graphs of the following equations are straight lines except?

y = 2x + 3

Straight lines have a constant slope (or rate of change), meaning every increase in x or y value results in the same increase or decrease in the other value. Options B and C meet this criteria and are therefore straight lines. Option D is a quadratic equation and represents a curved line. Option A represents a linear equation, but does not have a constant slope as the coefficient of x is 2, meaning every increase in x results in a greater increase in y. Therefore, option A is the only equation that does not have a straight line graph.

Get further explanation with Examzify DeepDiveBeta

y = -x + 4

y = 0.5x

y = x^2 + 3