3x+2y−z=22y+z=7−2x−4z=−2 Enter your answer, in the form (x, y,z), in the boxes in simplest terms.

First step is to get rid of the square root. remember that a square root is the same as raising to the (1/2) power. see below: multiply exponents per exponent rules to get: remember you subtract exponents from the denominator and add exponents in the numerator so: simplify further: so a is the correct choice. if you don't understand this google exponent rules and it will you understand. look at the image results.