The answer is (3,2). I did this by drawing a graph, inserting the two midpoints you provided, and put in each potential midpoint, finding (3,2) is the only midpoint that connects to the line.
X=7. if you need explanation message me
find unit rate:
36 / 6 = 6
she can ride 6 miles in 1 hour
104 is 8 times 13. but working 8 hours 7 days equals 56 times the hourly pay comes out to 728