A line that includes the points ( –
7,s) and (
–
8,
–
7) has a slope of
–
3. What is the value of s?

Answer is either b or c

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.