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2 years ago

5

Andros has an oil fired heating system. In a 30-day period he used a full tank of oil at a constant rate per day. At a different

time of the year the amount of oil Andros uses per day is 1 3 of the rate used in the 30-day period. (a) How many days should a full tank of oil?

1 answer:

Bingel [31]2 years ago

3 0

Step-by-step explanation:

30 days period multiply by 7 days

=210 therefore our answer is =210

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Step-by-step explanation:

Given equations are:

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x+y = - 2 Eqn 2

From eqn 2:

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Putting x=-y-2 in eqn 1

$2(-y-2)-3y=-9\\-2y+4-3y=-9\\-5y-4=-9\\Adding\ 4\ on\ both\ sides\\-5y-4+4=-9+4\\-5y=-5\\Dividing\ both\ sides\ by\ -5\frac{-5y}{-5}=\frac{-5}{-5}\\y=1\\Putting\ y=1\ in\ eqn\ 2\\x+1=-2\\Subtracting\ 1\ from\ both\ sides\\x+1-1=-2-1\\x=-3$

Hence,

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