Robert says that the slope of a line passing through (1,7) and (3,9) is equal to the ratio 1-3/7-9. is this a correct method for calculating the slope? explain your answer.

Slope is equal to y2-y1 over x2-x1, however robert put the x on the top and the y on the bottom. However, if the fraction was FLIPPED, he would be correct.

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.