1] Let x,y∈R. Prove that ∀x∀y(4x+9y>9⇒(x>5/4 ∨ y> 4/9)) using method of indirect proof. 2] Let x,y∈R Prove that ∀x∀y(10x

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answerhappygod
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1] Let x,y∈R. Prove that ∀x∀y(4x+9y>9⇒(x>5/4 ∨ y> 4/9)) using method of indirect proof. 2] Let x,y∈R Prove that ∀x∀y(10x

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1] Let x,y∈R. Prove that ∀x∀y(4x+9y>9⇒(x>5/4 ∨ y> 4/9))using method of indirect proof.
2] Let x,y∈R Prove that ∀x∀y(10x+21y>21⇒(x>11/10 ∨y>10/21))
3] Let x, y∈R Using proof by contradiction, prove that∀x∀y(512y3+8X2y≤x3+64y2x⇒8y≤x)
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