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monitta
3 years ago
8

2x + 6y = -2 -x + 2y = 6 By elimination method

Mathematics
2 answers:
Agata [3.3K]3 years ago
8 0

Good evening ,

Answer:

<h2>the solution couple is (-4,1)</h2>

Step-by-step explanation:

2x + 6y = -2 (1)

-x + 2y = 6 (2)

(1) - 3×(2) ⇒ (2x+6y) - 3×(-x+2y) = -2 - 3×6

              ⇒ 5x = -20

              ⇒ x = -4

therfore (1) ⇒ 4 + 2y = 6 ⇒ 2y = 2 ⇒ y=1.

:)

Anna007 [38]3 years ago
3 0

Answer:

 x = -4 ;  y = 1

Step-by-step explanation:

2x + 6y = -2   --------(i)

-x + 2y = 6     --------(ii)

            2x + 6y = -2

(ii)*2  <u>   -2x + 4y = 12</u>

add;              10y = 10

                        y = 10/10

                       y = 1

Substitute y in (i)

2x + 6*1 = -2

2x +6= -2

2x = -2-6

2x = -8

x = -8/2

x = -4

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Hi!


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3 years ago
Find the angle of elevation of the sun from the ground to the top of a tree when a tree that is 10 yards tall casts a shadow 14
Hitman42 [59]

Answer:

The angle of elevation of the sun from the ground to the top of a tree is 36^{\circ}.

Step-by-step explanation:

As given

The sun from the ground to the top of a tree when a tree that is 10 yards tall casts a shadow 14 yards long.

Now by using the trignometric identity .

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As figure is  given below .

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7 0
4 years ago
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Answer:

y = -6

Step-by-step explanation:

Step 1: Simplify both sides of the equation.

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0.75y+−1.5y+0.5=5

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