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polet [3.4K]
2 years ago
15

Solve system of equation by elimination: 4x - y = 1 3x + y = -1

Mathematics
1 answer:
riadik2000 [5.3K]2 years ago
8 0
The answer would be a: (0, -1). Hope this helps.
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KiRa [710]
The problem is asking how much each person will need to pay. Simplifying the problem into an equation with variables (an algorithm) will greatly help you solve it:

S = Sales Tax = $ 7.18 per any purchase
A = Admission Ticket = $ 22.50 entry price for one person (no tax applied)
F = Food = $ 35.50 purchases for two people

We know the cost for one person was: (22.50) + [(35.50/2) + 7.18] =
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Method A)
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Method A is the correct answer

Method B)
[(2A + (1/2)F + 2S) /2 = [(2)(22.50) + 35.50(1/2) + (2)7.18] / 2 = $38.55
Wrong answer. This method is incorrect because the tax for both tickets bought are not being used in the equation.

Method C)
[(A + F) / 2 ]+ S = [(22.50 + 35.50) / 2 ] + 7.18 = $35.93
Wrong answer. Incorrect Method. The food cost is being reduced to the cost of one person but admission price is set for two people.
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3 years ago
What is the value of y when the value of x is 1 Car mileage for a hybrid car
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Step-by-step explanation:

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Answer:

{f}^{ - 1}(x)  =  \frac{x + 11}{ - 5}

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f(x) =  - 5x - 11 \\  - 5x - 11 =x \\  - 5x = x + 11 \\  {f}^{ - 1}(x)  =  \frac{x + 11}{ - 5}

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3 years ago
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