Originally Posted by: rockonn91those are known as power chords- they're just the root, 5th, and another root of a chord, just an octave up. once you get those down, you can play just about any rock song of all time.

With all due respect by not trying to correct this statement, it does bring up an important topic. The Power Chord is very common in rock music, which doesn't voice the 3rd from it's tonal center. So in reality, a Power Chord is neither Major or minor and is used in either key signature.
The above Chord Tabs do however depict a 3rd present, which make them a Major triad and when played will sound Major. They are both Major Chords in music Theory.