Question

А)9-7y=25-3y Б)-2n=5,6 в)2(11-4a)=3-(5a+2)

Answer 1

А) 9-7y=25-3y
    9-25=7y-3y
    -16=4y
       y=-4
Б) -2n=5.6
      n=- 5.6/2
      n=-2.8
В) 2(11-4a)=3-(5a+2)
     22 - 8a=3-5a-2
     22-1=8a-5a
      21=3a
      a=7

Answer 2

А) To solve the equation 9-7y=25-3y, we can start by simplifying both sides of the equation:

9 - 7y = 25 - 3y

First, let's gather the terms with y on one side by adding 7y to both sides:

9 - 7y + 7y = 25 - 3y + 7y

This simplifies to:

9 = 25 + 4y

Next, let's isolate the term with y by subtracting 25 from both sides:

9 - 25 = 25 + 4y - 25

This simplifies to:

-16 = 4y

Finally, divide both sides of the equation by 4 to solve for y:

-16/4 = 4y/4

This gives us:

-4 = y

So the solution to the equation is y = -4.

Б) To solve the equation -2n = 5.6, we can start by isolating the variable n.

We have:

-2n = 5.6

To isolate n, we can divide both sides of the equation by -2:

(-2n)/(-2) = 5.6/(-2)

This simplifies to:

n = -2.8

So the solution to the equation is n = -2.8.

в) To solve the equation 2(11-4a) = 3 - (5a + 2), we can start by simplifying both sides of the equation:

2(11 - 4a) = 3 - (5a + 2)

First, let's simplify the expression inside the parentheses:

2(11 - 4a) = 3 - 5a - 2

Next, simplify further:

22 - 8a = 3 - 5a - 2

Combine like terms:

22 - 8a = 1 - 5a

To isolate the term with a, let's add 8a to both sides:

22 - 8a + 8a = 1 - 5a + 8a

This simplifies to:

22 = 1 + 3a

Next, let's isolate the term with a by subtracting 1 from both sides:

22 - 1 = 1 + 3a - 1

This simplifies to:

21 = 3a

Finally, divide both sides of the equation by 3 to solve for a:

21/3 = 3a/3

This gives us:

7 = a

So the solution to the equation is a = 7.