Solve the system using elimination.
7x + 5y = 15
–6x – 4y = –14
a.(–6, 7)
b.(5, -4)
c.(7, –7)
d.(–4, 5)

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.