Answer: 0.50+2pin and -3.64+2pin
Step-by-step explanation:
Let
x---------> represent the number of miles Troy's has driven
y--------> represent the amount of gas in Troy's truck
we know that
the equation that represents the amount of gas, y, in troy' s truck after driving a certain number of miles, x is

where
m is the slope---------> 
in this problem the slope is equal to 
it's negative because the tank is going to be consumed
assuming he starts with a full tank

substitute in the formula above

therefore
the answer is
the equation 
8 (y - 7) = - 16
Divide by 8 on both sides
y - 7 = - 2
Add 7 to both sides
y = 5
Answer:
180
Step-by-step explanation:
90 x 2 =180 hope this helps :)