Which of the following equations is equivalent to .25x - .5y = 8?
2x - 4y = 82x - 4y = 644x - 2y = 6

0.25x - 0.5y = 8  |multiply both sides by 8

2x - 4y = 64

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.