1] Let x,yER. Prove that VxVy(4x+9y>9⇒(x>5/4 Vy> 4/9)) using method of indirect proof. 21 Let x VFR Prove that 10x+21v>21=(x>11/10 v v>10/21))

Elementary Geometry For College Students, 7e
7th Edition
ISBN:9781337614085
Author:Alexander, Daniel C.; Koeberlein, Geralyn M.
Publisher:Alexander, Daniel C.; Koeberlein, Geralyn M.
Chapter2: Parallel Lines
Section2.CT: Test
Problem 3CT: To prove a theorem of the form "If P, then Q" by the indirect method, the first line of the proof...
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1] Let x,yER. Prove that
VxVy(4x+9y>9⇒(x>5/4 Vy> 4/9)) using method of indirect proof.
(x>11/10 v y>10/21))
2] Let X,YER Prove that VxVy(10x+21y>21
4] Let x, YER Using proof by contradiction, prove that VxVy(512y3+8x²y<x³+64y²x+8y≤x)
Transcribed Image Text:1] Let x,yER. Prove that VxVy(4x+9y>9⇒(x>5/4 Vy> 4/9)) using method of indirect proof. (x>11/10 v y>10/21)) 2] Let X,YER Prove that VxVy(10x+21y>21 4] Let x, YER Using proof by contradiction, prove that VxVy(512y3+8x²y<x³+64y²x+8y≤x)
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