Answer: 70
Step-by-step explanation:
Antoine's elevation when he is halfway to the top is 70. You cut the diameter (120) in half which gets you 60 and you add the height of the stand holding the wheel (10) which gets you 70.
Graph the point (5,1) and use the slope 2/3 to go up 2 and 3 to the right.
If you're confused on anything else, feel free to message me. :)