The following data represent the prices in dollars of general admission tickets for the last 18 concerts at one venue. $56 $73 $43 $52 $48 $66 $58 $68 $44 $57 $55 $45 $53 $45 $75 $53 $57 $62 Determine the leaves for the given data points in the range 70 to 79 for this stem-and-leaf plot.

So the first thing we do is to multiply the top equation by 3. the reason i want to do this is i notice there will be a 6y on both equations and can possibly add/subtract them. so we get 6y = -3x + 27. adding that and the second equation we get 6x = 27-15 which is 12. divide by 6 and we get 2. ∴ x = 2. substituting 2 into the first equation we get 2y = -2 + 9 which is 7. divide by 2 and we get 7/2. ∴ y = 7/2, x = 2.