24. In Exercise 2, one equation relating Kateri's quarters and dimes to her goal of $10 (1,000 cents) is 25x+10y = 1,000.
Suppose Kateri collects 70 coins to reach her goal. a. What equation relates x and y to the number of coins Kateri collected?
b. Graph both equations on the same grid. Find the coordinates of the intersection point. Explain what these coordinates tell you about this situation.