Do the points (1, 2), (51, 27) and (91, 48) lie on a straight line? Give reasons for your answer.

Ithink the answer is: it is likely.

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.