Question

-8с+3=-11-6с -0,9+1/2а=-4,8-4/5а -0,6х-(1,5-2х)=-3(0,1-0,2х) -2/у-4=7/5-3н

Answer 1

-8с+3=-11-6с

8с-6с=11+3

2с=14

с=7

 

-0,9+1/2а=-4,8-4/5а 

-0,9+0,5а=-4,8-0,8а

0,8а+0,5а=-4,8+0,9

1,3а=-3,9

а=-3,9:1,3

а=-3

 

-0,6х-(1,5-2х)=-3(0,1-0,2х)

-0,6х-1,5+2х=-0,3+0,6х

-0,6х+2х-0,6х=1,5-0,3

0,8х=1,2

х=1,5

 наверно ошибка в условии, а скорее всего так

-2у-4=7/5-3у 

3у-2у=1,4+4

у=5,4 

Answer 2

-8с+3=-11-6с    -8с+6с=-11-3   -2с=-14   с=7

-0.9+1/2а=-4.8-4/5а   0.5а+0.8а=-4.8+0.9   1.3а=-3.9   а=-3

-0.6х-(1.5-2х)=-3(0.1-0.2х)   -1.2х+2х=-0,3+1,5   0,8х=1,2   х=1,5

 -2у-4=7/5-3у   у=1,4+4  у=5,4

Answer 3

To solve these equations, let's go through them one by one:

1. -8с + 3 = -11 - 6с

Let's simplify the equation by combining like terms: -8с + 6с = -11 - 3 -2с = -14

Divide both sides by -2 to solve for c: -2с / -2 = -14 / -2 с = 7

Therefore, the solution to this equation is c = 7.

2. -0.9 + (1/2)a = -4.8 - (4/5)a

First, let's eliminate the fractions by multiplying the entire equation by the least common denominator (LCD) of 10: 10*(-0.9) + 10*(1/2)a = 10*(-4.8) - 10*(4/5)a -9 + 5a = -48 - 8a

Move the variable terms (5a and -8a) to one side and the constant terms (-9 and -48) to the other side: 5a + 8a = -48 + 9 13a = -39

Divide both sides by 13 to solve for a: 13a / 13 = -39 / 13 a = -3

Therefore, the solution to this equation is a = -3.

3. -0.6x - (1.5 - 2x) = -3(0.1 - 0.2x)

First, let's simplify both sides of the equation: -0.6x - 1.5 + 2x = -0.3 + 0.6x

Combine like terms: 1.4x - 1.5 = -0.3 + 0.6x

Move the variable terms (1.4x and 0.6x) to one side and the constant terms (-1.5 and -0.3) to the other side: 1.4x - 0.6x = -0.3 + 1.5 0.8x = 1.2

Divide both sides by 0.8 to solve for x: 0.8x / 0.8 = 1.2 / 0.8 x = 1.5

Therefore, the solution to this equation is x = 1.5.

4. -2/y - 4 = 7/5 - 3n

First, let's simplify both sides of the equation: -2/y - 4 = 7/5 - 3n

Move the constant terms (-4 and 7/5) to one side and the variable term (-2/y and -3n) to the other side: -2/y = 7/5 - 4 + 3n

Combine the constant terms: -2/y = 7/5 - 20/5 + 3n -2/y = -13/5 + 3n

Find a common denominator for the fractions: -2/y = (-13 + 15n) / 5

To make the equation easier to solve, we can cross-multiply: -25 = y(-13 + 15n)

-10 = -13y + 15ny

Now, we can solve for y by isolating it: -10 + 13y = 15ny -10 = 15ny - 13y -10 = y(15n - 13)

Divide both sides by (15n - 13) to solve for y: -10 / (15n - 13