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Nitella [24]
3 years ago
8

Solve the system using substitution 8x+9y=15 5x-2y=17

Mathematics
1 answer:
Otrada [13]3 years ago
8 0

5x-2y=17\ \ \ \ |-5x\\-2y=-5x+17\ \ \ \ |:(-2)\\y=2.5x-8.5\\\\\text{substitute to the first equation}\\\\9x+9(2.5x-8.5)=17\ \ \ \ |\text{use distributive property}\\9x+22.5x-76.5=17\ \ \ \ |+76.5\\31.5x=93.5\ \ \ \ |:31,5\\x=3\\\\\text{substitute the value of x to the equation}\ y=2.5x-8.5\\\\y=2.5(3)-8.5=7.5-8.5=-1\\\\Answer:\ x=3,\ y=-1\to(3;\ -1)

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4 years ago
Michelle did a survey in four butterfly parks and wrote the following observations:
PolarNik [594]

Answer:

A. 55%

Step-by-step explanation:

First we should make these into fractions

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these are the fractions, The question wants us to pick the Park with the <u>Greatest Percentage, </u>Not The Greatest Amount, so Lets look at these fractions A. 33/60 Is 55%   B. 36/78 is  46% .   C. 40/89 is 44%   D. 24/59 is about 40%

I also remember doing this on a quiz!!

6 0
3 years ago
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Answer:

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Step-by-step explanation:

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Add 14 to both sides

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Divide both sides by 12

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3 0
3 years ago
Read 2 more answers
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nignag [31]
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25:35
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3 years ago
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Answer:

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