Question

А) 0,8х - 9 = 3х + 13 б) 1,3у - 14,2 = 11,3 - 3,8у в) 2,7х + 4,7 = 2,3х + 9,54 г) 1,3у - 2,9 = 2,3 - 0,7у

Answer 1

$0.8x - 9 = 3x + 13 \\ 0.8x - 3x = 13 + 9 \\ - 2.2x = 22 \\\\ x = - \frac{22}{2.2}\\ \\ x = - 10$
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$1.3y - 14.2 = 11.3 - 3.8y \\ 1.3y + 3.8y = 11.3 + 14.2 \\ 5.1y = 25.5 \\ \\ y = \frac{25.5}{5.1} \\ \\ y = 5$
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$2.7x + 4.7 = 2.3x + 9.54 \\ 2.7x - 2.3x = 9.54 - 4.7 \\ 0.4x = 4.84 \\ x = 12.1$
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$1.3y - 2.9 = 2.3 - 0.7y \\ 1.3y + 0.7y = 2.3 + 2.9 \\ 2y = 5.2 \\ y = \frac{5.2}{2} \\ y = 2.6$
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Готово.
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Answer 2

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Ответ во вложении
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Answer 3

Let's solve the equations one by one:

a) 0.8x - 9 = 3x + 13

To solve this equation, we need to isolate the variable x on one side of the equation. Let's rearrange the equation:

0.8x - 3x = 13 + 9

-2.2x = 22

Dividing both sides by -2.2, we get:

x = -10

Therefore, the solution to the equation is x = -10.

b) 1.3y - 14.2 = 11.3 - 3.8y

Let's simplify the equation:

1.3y + 3.8y = 11.3 + 14.2

5.1y = 25.5

Dividing both sides by 5.1, we get:

y = 5

So, the solution to the equation is y = 5.

c) 2.7x + 4.7 = 2.3x + 9.54

Let's simplify the equation:

2.7x - 2.3x = 9.54 - 4.7

0.4x = 4.84

Dividing both sides by 0.4, we get:

x = 12.1

Therefore, the solution to the equation is x = 12.1.

d) 1.3y - 2.9 = 2.3 - 0.7y

Let's simplify the equation:

1.3y + 0.7y = 2.3 + 2.9

2y = 5.2

Dividing both sides by 2, we get:

y = 2.6

So, the solution to the equation is y = 2.6.

To summarize: a) x = -10 b) y = 5 c) x = 12.1 d) y = 2.6