15. Match the function with its graph (labeled I–VI). Give reasons for your choices. (a) f(x, y) = |x| + |y| (b) f(x, y) = |xy|| 1 (c) f(x, y) : (d) f(x, y) = (x² – y²)² 1 + x? + y? (е) F(х, у) — (х — у? (f) f(x, y) = sin(\x| + |y|) I II ZA y X A y III ZA IV V VI y y

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