For every input, there is one output
for every x there is one y
(x,y)
if x repeats with a differnt y, it's not a function
we see
(2,3) and (2,4) and all of them
no, not a function
<span>no, each ordered pair in this list has the same first element
answer is first one
</span>
3/8 * 6/7
6*3=18
8*7=56
18/56 simplified is 9/28