M = y2-y1 / x2-x1
= 2-1 / 1-2
= 1 / -1
= -1
It would be 5%. I know the answer is right I just don’t know how to explain it. Sry. But I hope this helps.
First find how many units of solution there is:
500* 2% = 500(.02) = 10 units
You need 10 units of solution in 'x' units of a 10% solution.
x*10% = 0.1x = 10 units -----> x = 10/0.1 = 100
100 units are needed
5*20=100, the answer would be 100 dots
