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Arada [10]
4 years ago
5

-3x+3y=12 4x+2y=20 Please help its elimination. It's really hard I can't solve it

Mathematics
1 answer:
Karo-lina-s [1.5K]4 years ago
5 0
-3x + 3y = 12<u /> ⇒ -12x + 4y = 48
 4x + 2y = 20 ⇒   <u>12x + 6y = 60</u>
                                   <u>-2y</u> = <u>-12</u>
                                    -2      -2
                                      y = 6
                          4x + 2(6) = 20
                            4x + 12 = 20
                            <u>       -12  -12</u>
                                    <u> 4x</u> =<u> 8</u>
                                      4     4
                                       x = 2
                                 (x, y) = (2, 6)
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ira [324]

Answer:

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Step-by-step explanation:

We can use the tan trig ratio to calculate the height of the tower.

\sf tan(\theta)=\dfrac{O}{A}

where:

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  • O = the side opposite the angle
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From inspection of the diagram:

  • \theta = 37°
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Substituting these values into the trig tan ratio:

\sf \implies tan(37)=\dfrac{h}{220}

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\sf \implies h=165.781891

Therefore, the height of the tower is 165.8 ft (nearest tenth)

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