Consider the equation of the surface S given by -2x" - yPz° + xy = -4, where a is an odd number and B is an odd number. An equation for the line normal to S at the point (1,-1,-1) is given by: (x, y, z) = teR (1, – 1, –1) + t(-7,6,9), t e R The value of a is given by:

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