aliyahlknox881
24.07.2019 •
Mathematics
If tina traveled 3,600 miles in 9 hours on her plane flight to her vacation destination, how fast was the plane traveling? a. 400 mph b. 395 mph c. 405 mph d. 390 mph
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Ответ:
3600/9 = 400
A. 400 mph is your answer
hope this helps
Ответ:
x = 3, y = - 9
Step-by-step explanation:
5x + 5y = - 30 (1)
2x - y = 15
-y = 15 - 2x
y = 2x - 15 (2)
From equations (1) & (2)
5x + 5(2x - 15) = - 30
5x + 10x - 75 = - 30
15x = 75 - 30
15x = 45
x = 45/15
x = 3
Plug x = 3 in equation (2)
y = 2*3 - 15
y = 6 - 15
y = - 9
Therefore,
x = 3, y = - 9
or
(x, y) = (3, - 9)