Answer:
1. Tyler
2. 8.33
3. 8.5
4. Tyler
Explanation:
this is just playing with the numbers. no complex math concepts.
Tyler's graph shows she reached 1 mile after 8 1/3 minutes (8 minutes and 20 seconds). that is 25/3 minutes.
according to Elena's equation she reached 1 mile (x=1) after 8.5 minutes. that is 8 1/2 minutes or 8 minutes and 30 seconds.
so, we see that Elena took more time (10 seconds longer) to run 1 mile, so Tyler was faster.
to generally compare the 2 we can write also Tyler's graph as function (like for Elena) :
8 1/3 = 8.333333....
y = 8.33x
but that is just FYI (not asked for here).
since Tyler was faster (and her graph also showed a straight line of time and distance up to 10 minutes and beyond, so, she did not slow down after the first mile), she also ran further after 10 minutes. that is the definition of "being faster" - to go further in the same amount of time.
Tyler needed 8.33 minutes per mile.
Elena needed 8.5 minutes per mile.
and so, Tyler was faster.
points 1 and 4 are directly coupled. they both express the same thing.