Question

5x+n=3.8+4+1.2x n=-7 2.3y-6=1.8-1.7y+n n=4.2 1 1 21 - y+9+ - y = 1 - y+n n=10 2 6 3

Answer 1

1) 

заменяем сразу n числом

5x-7=3.8+4+1.2x

3.8x=7.8+7

x=14.8/3.8

x=~3.89

 

2) 

2.3y-6=1.8-1.7y+4.2

-7.8-4.2=-4y | *(-1)

y=4

 

3)

3/2y+9+1/6y=5/3y+10

9y/6+54/6+1y/6=10y/6+60/6

9y+54+y=10y+60

10y-10y=60-54

0y=6

 

 Ооо !!!

 

 

 

Answer 2

1)5x-7=3.8+4-8.4

    5x-7=-0.6

    5x=6.4

    x=1.28

2)3y-6=1.8-1.7y+4.2

    4.7y=12

    y=120/47

3) (3/2)y+9+(1/6)y=(5/2)y+10

(9/6+1/6-10/6)y+9=10

9=10

решений нет

Answer 3

It looks like you've provided a system of equations. Let's work through it step by step to find the solution.

First, you've provided the following equations:

1. 5x + n = 3.8 2. 4 + 1.2x + n = -7 3. 2.3y - 6 = 1.8 - 1.7y + n + n = 4.2 4. 1 + 1 + 21 - y + 9 - y = 1 - y + n + n = 10 + 2 + 6 + 3

Solve for x and y

To solve for x and y, we can use the given equations. Let's start by solving equations 1 and 2 to find the values of x and n.

From equation 1: 5x + n = 3.8

From equation 2: 1.2x + n = -11

We can solve these equations simultaneously to find the values of x and n.

Subtracting the second equation from the first: (5x + n) - (1.2x + n) = 3.8 - (-11) 3.8x = 14.8 x = 14.8 / 3.8 x = 3.8947

Now that we have the value of x, we can substitute it back into either equation 1 or 2 to solve for n.

Let's substitute x = 3.8947 into equation 1: 5(3.8947) + n = 3.8 19.4735 + n = 3.8 n = 3.8 - 19.4735 n = -15.6735

So, the values of x and n are: x ≈ 3.8947 n ≈ -15.6735

Next, we can proceed to solve for y using equations 3 and 4.

From equation 3: 2.3y - 6 = 1.8 - 1.7y + n + n = 4.2

From equation 4: 1 + 1 + 21 - y + 9 - y = 1 - y + n + n = 10 + 2 + 6 + 3

It seems that there might be a mistake in the provided equations. Could you please double-check the equations and ensure they are accurately represented?