Which is not a linear equation in two variables? *x + 7y = 13x +4y -xy = 03x + 9 = 4y - 13x = 4y

Which is not a linear equation in two variables? *x + 7y = 13x +4y -xy

1.	Which is not a linear equation in two variables? *x + 7y = 13x +4y -xy = 03x + 9 = 4y - 13x = 4y
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