2 years ago

Does anyone know the answer???

Mathematics

1 answer:

shepuryov [24]2 years ago

7 0

Answer:

D,1

Step-by-step explanation:

In the attached file

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What is the result of subtracting the second equation from the first? \begin{aligned} x-3y &= 6 \\\\ -8x-y &= 6 \end{ali

Mila [183]

Answer:

Therefore the required result is 9x-2y =0.

Step-by-step explanation:

Given equation are

x-3y =6.....(1)

-8x-y=6 .....(2)

Subtracting equation (2) from (1)

x - 3y = 6

-8x - y= 6

+ + - [ The sign of equation (2) will be change in case of

_________ subtraction and in case of plus the signs remains same ]

(x+8x)-3y+y=6-6 [ adding the like terms]

⇒9x-2y =0

Therefore the required result is 9x-2y =0.

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3 years ago

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2 years ago

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Natalija [7]

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3 years ago

1. The sum of three times k and eight is eleven

ludmilkaskok [199]

Answer:

k=1

Step-by-step explanation:

$3k + 8 = 11\\$

Subtract 8 from both sides

$3k = 3$

Divide

$\frac{3k}{3} = \frac{3}{3}$

Simplify

$k =1$

4 0

2 years ago

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the sum of the first n terms of a sequence is 20 - 10 / 2 ^ n - 1 find the sum of the first five terms

Travka [436]

Answer:

$S_5=\dfrac{170}{9}$

Step-by-step explanation:

Given that,

The sum of first n term of a sequence is $S_n=20-\dfrac{10}{2n-1}$

We need to find the sum of the first 5 terms.

Put n = 5,

$S_5=20-\dfrac{10}{2(5)-1}\\\\=20-\dfrac{10}{10-1}\\\\=20-\dfrac{10}{9}\\\\=\dfrac{170}{9}$

So, the sum of first 5 terms is equal to $\dfrac{170}{9}$ .

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2 years ago