Use the distributive property to remove the parentheses , 12(3-y)​

12(3-y)
= 36-12y

Basically all I did was multiple 12 by 3 and then multiple 12 by -y!! :)

36 - 12y

To distribute multiply what is outside of the parentheses by what is inside them. 12 x 3 = 36
12 x -y = -12y

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.

so the perpendicular line goes through the given pointyou would get a perpendicular line at some random location

step-by-step explanation:

points a and b are equidistant from the desired line, so the line you find by using them will go through point r.

using points other than a and b will give the desired line only if they are equidistant from r. if they are randomly located, the perpendicular line you create will not necessarily go through point r, hence will not be a solution to the problem.