if you put the points into the equation y2 - y1/x2 - x1 you'll end up with a zero in the denominator, which indicates a vertical slope. Basically the slope(m) is undefined
It's really easy to tell if your answer is going to be undefined if both the x values are the same (in this case they're both 9)
Actual price of the dress = 72
Selling price = 45
72 - 45 = $ 27
Percentage of decrease =

<h3>= <u>37.5%</u></h3>
.... Hope this will help.....
He planted 92 of those because 12 times 6 is 72 and 72 plus 20 is 92 therefore the answer is 92
what do you need help on ? LMFA O