Answer:
Alex starts with 125 and April starts with 100.
Step-by-step explanation:
Since Alex wrote an equation to show the total, y, she has saved at the end of each week, x.

In order to find the starting amount of Alex, we need to put x = 0
Therefore we would get,

Thus, Alex's starting amount was 125.
And since April made a graph with x = 0, and 7 = 100, this would make April's starting amount is 100.
Hense, Alex's savings amount is greater than April's.