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Alona [7]
3 years ago
8

Please help, and show work pleaseee x+3y=-14 2x-4y=30

Mathematics
1 answer:
Marrrta [24]3 years ago
4 0

Answer:

x=3.4   y=-5.8  (the steps are in order and I explained to the best of my ability)

Step-by-step explanation:

x+3y=-14                      substitute the x for -14-3y in the second problem

x=-14-3y                       2(-14-3y)-4y=30

                                   -28-6y-4y=30

                                   -10y=58

                                   y=-5.8

substitute the y in the first equation for -5.8

x+3(-5.8)=-14

x-17.4=-14

x=3.4

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Given: △ABC, m∠A=60° m∠C=45°, AB=8 Find: Perimeter of △ABC, Area of △ABC
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We are given

△ABC, m∠A=60° m∠C=45°, AB=8

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we know that sum of all angles is 180

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we can plug values

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\frac{AB}{sin(C)}=\frac{AC}{sin(B)}

now, we can plug values

\frac{8}{sin(45)}=\frac{AC}{sin(75)}

AC=\frac{8}{sin(45)} \times sin(75)

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p=10.928+8+9.798

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Area:

we can use formula

A=\frac{1}{2}AB \times AC \times sin(A)

now, we can plug values

A=\frac{1}{2}8 \times 10.928 \times sin(60)

A=37.85570...............Answer

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