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Brums [2.3K]
4 years ago
5

-15x-9y=-2-35x-5y=14

Mathematics
1 answer:
riadik2000 [5.3K]4 years ago
4 0
1) -15x-9y= -2
-9y = 15y-2
y = 15/9 - 2

2) -35x-5y= 14
-5y = 35x+14
y = -7x + 14
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You need to round 6.018 to 6 then multiply it by 9 which results in 54!
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3 years ago
A pigpen is to be enclosed using 640 m of fencing along three of its sides, the fourth side being a barn. Determine the dimensio
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Answer:

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Step-by-step explanation:

Since we know we only have 640 feet of fence available, we know that L + W + L = 640, \implies 2L + W = 640. This allows us to represent the width, W, in terms of L: W = 640 – 2L

Remember, the area of a rectangle is equal to the product of its width and length, therefore,

A_{\rm pigpen}=L(640-2L)\implies 640L-2L^2

Notice that, quadratic has been vertically reflected, since the coefficient on the squared term is negative, so the graph will open downwards, and the vertex will be a maximum value for the area.

recall,

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Since our function is A(L)=640L-2L², we get

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plug in the value of a and b into the first formula:

L_{max}=-(640)/2(-2)\implies 160

A(L)_{max}=640(160)-2(160)^2\implies 76800

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and we're done!

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Answer:

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