Question

1) 8-0,2а=0,4а+4 2) 1,9-6с=-6,6с+7,93) 9-1,2z=0,6z+7,24) -15x+3=3x+215) -0,3y+1=-0,7y+3помогите пожалуйста​

Answer 1

Ответ:

1) 6 2/3  2)10  3)1  4)-1  5)5

Пошаговое объяснение:

1) 8-0,2а=0,4а+4

-0,2a-0.4a=4-8

-0.6a=-4

a=(-4)/(-0.6)

a=6 2/3

2) 1,9-6с=-6,6с+7,9

-6c+6.6c=7.9-1.9

0.6c=6

c=6/0.6

c=10

3) 9-1,2z=0,6z+7,2

-1.2z-0.6z=7.2-9

-1.8z=-1.8

z=(-1.8)/(-1.8)

z=1

4) -15x+3=3x+21

-15x-3x=21-3

-18x=18

x=18/(-18)

x=-1

5) -0,3y+1=-0,7y+3

-0.3y+0.7y=3-1

0.4y=2

y-2/0.4

y=5

Answer 2

1) To solve the equation 8 - 0.2a = 0.4a + 4, we can start by simplifying both sides of the equation.

On the left side, we have 8 - 0.2a.

On the right side, we have 0.4a + 4.

To simplify the equation, we can combine like terms.

First, let's move the 0.4a term to the left side by subtracting 0.4a from both sides of the equation.

This gives us 8 - 0.2a - 0.4a = 4.

Simplifying further, we have 8 - 0.6a = 4.

Next, let's isolate the variable by moving the constant term to the right side.

We can do this by subtracting 8 from both sides of the equation.

This gives us -0.6a = 4 - 8.

Simplifying further, we have -0.6a = -4.

Finally, to solve for a, we can divide both sides of the equation by -0.6.

This gives us a = -4 / -0.6.

Simplifying further, we have a = 6.67.

Therefore, the solution to the equation 8 - 0.2a = 0.4a + 4 is a = 6.67.

2) To solve the equation 1.9 - 6c = -6.6c + 7.9, we can start by simplifying both sides of the equation.

On the left side, we have 1.9 - 6c.

On the right side, we have -6.6c + 7.9.

To simplify the equation, we can combine like terms.

First, let's move the -6.6c term to the left side by adding 6.6c to both sides of the equation.

This gives us 1.9 - 6c + 6.6c = 7.9.

Simplifying further, we have 1.9 + 0.6c = 7.9.

Next, let's isolate the variable by moving the constant term to the right side.

We can do this by subtracting 1.9 from both sides of the equation.

This gives us 0.6c = 7.9 - 1.9.

Simplifying further, we have 0.6c = 6.

Finally, to solve for c, we can divide both sides of the equation by 0.6.

This gives us c = 6 / 0.6.

Simplifying further, we have c = 10.

Therefore, the solution to the equation 1.9 - 6c = -6.6c + 7.9 is c = 10.

3) To solve the equation 9 - 1.2z = 0.6z + 7.2, we can start by simplifying both sides of the equation.

On the left side, we have 9 - 1.2z.

On the right side, we have 0.6z + 7.2.

To simplify the equation, we can combine like terms.

First, let's move the 0.6z term to the left side by subtracting 0.6z from both sides of the equation.

This gives us 9 - 1.2z - 0.6z = 7.2.

Simplifying further, we have 9 - 1.8z = 7.2.

Next, let's isolate the variable by moving the constant term to the right side.

We can do this by subtracting 9 from both sides of the equation.

This gives us -1.8z = 7.2 - 9.

Simplifying further, we have -1.8z = -1.8.

Finally, to solve for z, we can divide both sides of the equation by -1.8.

This gives us z = -1.8 / -1.8.

Simplifying further, we have z = 1.

Therefore, the solution to the equation 9 - 1.2z = 0.6z + 7.2 is z = 1.

4) To solve the equation -15x + 3 = 3x + 21, we can start by simplifying both sides of the equation.

On the left side, we have -15x + 3.

On the right side, we have 3x + 21.

To simplify the equation, we can combine like terms.

First, let's move the 3x term to the left side by subtracting 3x from both sides of the equation.

This gives us -15x + 3 - 3x = 21.

Simplifying further, we have -18x + 3 = 21.

Next, let's isolate the variable by moving the constant term to the right side.

We can do this by subtracting 3 from both sides of the equation.

This gives us -18x = 21 - 3.

Simplifying further, we have -18x = 18.

Finally, to solve for x, we can divide both sides of the equation by -18.

This gives us x = 18 / -18.

Simplifying further, we have x = -1.

Therefore, the solution to the equation -15x + 3 = 3x + 21 is x = -1.

5) To solve the equation -0.3y + 1 = -0.7y + 3, we can start by simplifying both sides of the equation.

On the left side, we have -0.3y + 1.

On the right side, we have -0.7y + 3.

To simplify the equation, we can combine like terms.

First, let's move the -0.7y term to the left side by adding 0.7y to both sides of the equation.

This gives us -0.3y + 1 + 0.7y = 3.

Simplifying further, we have 0.4y + 1 = 3.

Next, let's isolate the variable by moving the constant term to the right side.

We can do this by subtracting 1 from both sides of the equation.

This gives us 0.4y = 3 - 1.

Simplifying further, we have 0.4y = 2.

Finally, to solve for y, we can divide both sides of the equation by 0.4.

This gives us y = 2 / 0.4.

Simplifying further, we have y = 5.

Therefore, the solution to the equation -0.3y + 1 = -0.7y + 3 is y = 5.

I hope this helps! Let me know if you have any further questions.