9. Is the equation x2 - y = 9 a linear equation in two variables? Why? A. Yes, because x - y = 9 is just the same with Ax + By = C.
B. No, because x2 - y = 9 is just the same with Ax + By = C.
C. Yes, because the exponent of x is in degree 2.
D. No, because the exponent of x is in degree 2.
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