Question

B) 7x – 4 = x - 16; d) 5x + (3x - 7) = 9; f) (7x + 1) -(6x + 3) = 5;

Answer 1

Ответ:

____________________

Answer 2

Ответ:

Если перед скобкой имеется знак минус то при раскрытие все знаки внутри скобки меняются на обратную.

Answer 3

Let's solve each of these equations step by step:

B) 7x - 4 = x - 16:

First, let's isolate the variable x by moving the x term on the right side of the equation to the left side:

7x - x = -16 + 4

This simplifies to:

6x = -12

Now, divide both sides by 6 to solve for x:

6x/6 = -12/6

x = -2

So, the solution for equation B is x = -2.

D) 5x + (3x - 7) = 9:

First, simplify the equation by combining like terms within the parentheses:

5x + 3x - 7 = 9

Now, combine the x terms on the left side:

8x - 7 = 9

Next, add 7 to both sides to isolate the 8x term:

8x - 7 + 7 = 9 + 7

8x = 16

Now, divide both sides by 8 to solve for x:

8x/8 = 16/8

x = 2

So, the solution for equation D is x = 2.

F) (7x + 1) - (6x + 3) = 5:

First, simplify the equation by performing the subtraction within the parentheses:

7x + 1 - 6x - 3 = 5

Now, combine like terms on the left side:

(7x - 6x) + (1 - 3) = 5

x - 2 = 5

Next, add 2 to both sides to isolate the x term:

x - 2 + 2 = 5 + 2

x = 7

So, the solution for equation F is x = 7.