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kumpel [21]
3 years ago
10

Substitute -3x-8y=4 -2x+7y=15

Mathematics
1 answer:
Nikolay [14]3 years ago
3 0
-2x=15-7y
x=-7.5+3.5y

-3x-8y=4
-3(7.5+3.5y)-8y=4
-22.5-10.5y-8y=4
-22.5-18.5y=4
-18.5y=4+22.5
-18.5y=26.5
y=-53/35

the fraction might not be in lowest terms.
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What is the perimeter P of △DEF to the nearest whole number?
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Answer:

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Step-by-step explanation:

To find the perimeter of the triangle, we will follow the steps below:

First, we will find the length of the side of the triangle DE and FF

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we can now insert the values into the formula

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cross-multiply

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angle D= 180° - 91°

angle D = 89°

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angle E = 49 degrees

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ange D = 89 degrees

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we can now proceed to insert the values into the formula

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d sin 49° = 10 sin 89°

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This implies that length EF = 13.248

perimeter of ΔDEF = length DE + length EF + length DF

                                  =13.248   +  8.866  + 10

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                                    ≈ 32 to the nearest whole number

perimeter of ΔDEF  ≈ 32

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