If it is 5:30pm at 120°W, what time is it at the Prime Meridian?

There is a time difference of 1 hour for every 15 degree of longitude. So if we divide 120 with 15 we get 8 hours . So if it is 5:30pm at 120 west you have to add 8 hours as it will have time ahead of prime meridian. So at prime meridian it will 1:30 am.

Hope this helped

(4,-2)

explanation:

6x+4y=16

-6x-9y=-6

-5y=10

y=-2

x=4