The heal mountains are recognized by some geographer as picturesque scenery, exceptional mineral wealth, and geopolitical significance in Russian history
You would draw a table like the above ^
And you would input each x value (1,2,3,0,-1,-2,-3) into the equation one by one for the value of both x and y
I did the first one for you so you understand how to do it.
Answer:
Because time varies with change in longitudes
The answer is a hope this is helpful