What is the value of x in the solution to the system of equations?

-3x=2y+14
y=6x-18

a)50/9

b)22/15

c)-46/5

d)-22/9

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Aquantity with an initial value of 3900 decays exponentially at a rate of 35% every hour. what is the value of the quantity after 0.5 days, to the nearest hundredth?

Don't know how to find x given these segment lengths