The third set is equivalent to
2x + y = 2
2x + y = -2
clearly inconsistent.
I know I dislike it as well! Sorry you are having trouble with it! :)
<span>A Stem and Leaf Plot is a special table where each data value is
split into a "stem" (the first digit or digits) and a "leaf" (usually
the last digit).
</span>Since the key says 4|0= 40 the answer to your question is 12. Twelve cleaners have more than 80 ingredients.
Hope this helps :)
