In the context of the information you've provided, the y-coordinate of the y-intercept of a graph represents the amount of money Kevin has when he hasn't purchased any baseball cards (i.e., when the number of baseball cards purchased, represented by the x-coordinate, is 0).
In the scenario you described, if the y-coordinate is 70, this means that when Kevin hasn't purchased any baseball cards (x = 0), he has $70.
So, to summarize:
- Y-intercept (where x = 0): $70 (the amount of money Kevin has before any purchases)
- Point (20, 70): This data point indicates that after buying a certain number of baseball cards (20 cards), Kevin still has $70 remaining, which implies that his initial amount of money was sufficient to buy those cards.
This would suggest that the cost of the baseball cards received between those points leads to the conclusion that he was able to buy the cards without going below zero in funds.