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sergejj [24]
2 years ago
8

X+2y=82x-y=1mathe question​

Mathematics
1 answer:
Ira Lisetskai [31]2 years ago
4 0

Answer:

x = 2 and y = 3

Step-by-step explanation:

We have

x+2y = 8 -----equation (i)

2x-y = 1 -----equation (ii)

Now,

x+2y = 8

or, x = 8-2y ------equation (iii)

Again,

2x-y = 1

or, 2x = 1+y

or, 2x-1 = y

Putting the value of 'x' from equation (iii)

or, 2(8-2y)-1 = y

or, 16-4y-1 = y

or, 16-1 = y+4y

or, 15 = 5y

or, y = 15/5

or, y = 3

Putting the value of 'y' in equation (iii)

x = 8-2y

or, x = 8-(2×3)

or, x = 8-6

or, x = 2

Therefore, x = 2 and y = 3.

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Anastaziya [24]

Answer:

The only possible answer that is correct is the first one, x = -4.

Step-by-step explanation:

Simplify the given inequality as much as possible, and then substitute each of the given x values one by one to determine which is in the solution set.

9(2x + 1) < 9x - 18 becomes 18x + 9 < 9x - 18, which, if reduced by dividing all four terms by 9, becomes 2x + 1 < x - 2.

Simplifying further, we get x < - 3.  The only possible answer that is correct is the first one, x = -4.  -4 < -3 is true.

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The answer is below.

Step-by-step explanation:

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3 years ago
Pls tell me the answer with an explanation how you got it!
Flura [38]

Answer:

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Step-by-step explanation:

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8 0
3 years ago
Yara multiplies and divides a certain number by the same
Butoxors [25]

For this case we have to:

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y: Represents the exponent of base 10

So, considering a system of equations we have:

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From the first equation we have:

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Substituting in the second equation:

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We choose the positive value:

x = 0.4

So, the number is 0.4.

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Answer:

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