5. Let C = {x ∈ Z|x ≡ 7( mod 9)} and D = {x ∈ Z|x ≡ 1( mod 3)}. (a) If C ⊆ D? Justify your conclusion with a proof or a counterexample. (b) If D ⊆ C Justify your conclusion with a proof or a counterexample.

Q: divisors

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A: The Given P.D.Es are        (a) y+22∂2u∂x2-2xlogy∂2u∂y2+k∂u∂y-u=2e-x, k&gt;0       (b)…

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A: The given matrix is A = -1-201

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