Answer:
y=-2
Step-by-step explanation:
5y-4y=4y+6
y=4y+6
-3y=6
y=-2

You have

so showing that

amounts to the same as showing that

.
As

, you have

. By comparison, then, it follows that

at a faster rate, which means

must diverge.
It will take Katie 29 weeks to reach her goal and it will take Rebecca 28 weeks to reach her goal so Rebecca will finish one week before Katie.
Hope this helps!
The answer is c to the fourth power.
A reflect over the x-axis