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JulsSmile [24]
3 years ago
9

7x+9y=-41 and x+3y=1. Solve system of equations

Mathematics
1 answer:
galben [10]3 years ago
7 0

9514 1404 393

Answer:

  (x, y) = (-11, 4)

Step-by-step explanation:

You can subtract 3 times the second equation from the first to eliminate y.

  (7x +9y) -3(x +3y) = (-41) -3(1)

  4x = -44

  x = -11

Substituting into the second equation gives ...

  -11 +3y = 1

  3y = 12

  y = 4

The solution is (x, y) = (-11, 4).

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Answer:

1. The amount of time you keep your porch light on.

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Step-by-step explanation:

<u>Porch Light Time Example: </u>

The light does not turn on or off based on the bill, thus its independent, but the bill is effected by the amount of time the light is on thus dependent.

You keep your porch light on for 24 hours a day for 1 month, that month your electricity bill is $50.

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The thermostat temperature is not effected by the bill, thus its independent, but the bill is effected by the thermostat, thus dependent.

You set your thermostat to 70 degrees for 1 month, that month your electricity bill is $50.

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3 years ago
How many people are added to the world population each year answer?
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a mechanic build a customer for 4 hours labor plus 215 for parts the total bill was for 375. how much did the mechanic charge fo
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Answer:

The mechanic charged 40 for the labor per hour.

Step-by-step explanation:

Total bill paid = 375

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Also, the additional charges paid on the bill = 215

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