Math Help - Proove this theorem via contradiction

1. Proove this theorem via contradiction

if x+y>100 then x>50 or y>50

2. Re: Proove this theorem via contradiction

Originally Posted by omegatidus
if x+y>100 then x>50 or y>50
Suppose that $x\le50~\&~y\le 50$ then $x+y\le~?$

3. Re: Proove this theorem via contradiction

Start by assuming the negation of "x>50 or y>50." Then see if what you get somehow contradicts "x+y>100."

If this is too cryptic let me know and I will be a bit more explicit. Good luck!