4.(06.02 MC) The equation of line QR is y =
x + 1. Write an equation of a line perpendicular to line QR in slope-intercept form that contains point (5, 6). (4 points)

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.