Choices are 1. A multiple of equation 1
2. The sum of equation 1 and 2
3. A sum that replaces only the coefficient of x with the sum of the coefficients of x in equation 2 and 1
4. An equation that replaces only the coefficient of y with the sum of the coefficients of y in equations 1 and 2
5.the sum of the a multiple of equation 1 and 2

The first one minimumi hope my answer you.

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.