Answer:
1/3.
Step-by-step explanation:
2 x 6 = 12
1 2 3 4 5 6
1 2 3 4 5 6
4/12 = 1/3
12-y=9
3x-y=21
4y-10=2
1/4xy=6
The speed is the ratio between the distance and the time:

Data:
d=6343miles
t=9h

Then, the plane traveled at a speed of 704.77 miles per hour.
(1, M) this represents the miles per hour, which'll help find the other coordinates.
Expand
simplify 36 - 4.5x + 36 to -4.5x + 72
simplify 102 - 7.5x - 60 to -7.5x + 42
add 7.5x to both sides
simplify -4.5x + 72 + 7.5x to 3x + 72
subtract 72 from both sides
simplify 42 - 72 to -30
divide both sides by 3
simplify 30/3 to 10
Answer: x = -10