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Meanwhile, the following graphs do not show linear functions.

This graph shows a vertical line, which is not a function.

The following are linear equations:

•x = -2

•x + 3y = 7

•2x – 5y + 8 = 0

Meanwhile, the following are not linear equations:

•xy + 7 = x + y is not a linear equation because the term xy has degree 2.

•x + 3y2 = 6 is not a linear equation because the term 3y2 has degree 2.