- System of equations by substitution x+2y=6 and 3x-4y=3?

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Solve the system, if possible. x+2y+3z=27
-x+y+4z=5
x+y-4z=7? How do I trigonometrically solve for tension on two cables, holding up a single 200 lb block at different angles? Is the grand canyon considered an ecosystem? Calculate the freq. In Hz
b) An emission line for copper at 211.0 nm? I donâ€™t remember being born. What evidence is there that I was born out of another human being? I could have just appeared into existence?