Question

3. Теңдеуді шеш: а) 21х - 16 = 48; b) |3х - 81 + 19 = 3;помогите пожалуйста дам 60 баллов​

Answer 1

Ответ:

а)

21х=48+16

21х=64

х=64/21

в)

3х=3+81-19

3х=65

х = 65/3

Answer 2

Task 3: Solve the Equations

a) To solve the equation 21x - 16 = 48, we need to isolate the variable x. Here's how we can do it:

1. Add 16 to both sides of the equation: 21x - 16 + 16 = 48 + 16 21x = 64

2. Divide both sides of the equation by 21 to solve for x: 21x/21 = 64/21 x = 64/21

b) To solve the equation |3x - 81| + 19 = 3, we need to consider two cases: when 3x - 81 is positive and when it is negative. Let's solve it step by step:

Case 1: 3x - 81 is positive 1. Subtract 19 from both sides of the equation: |3x - 81| = 3 - 19 |3x - 81| = -16

Since the absolute value of a number cannot be negative, there is no solution in this case.

Case 2: 3x - 81 is negative 1. Multiply both sides of the equation by -1 to remove the absolute value: -|3x - 81| = -3

2. Remove the negative sign from both sides of the equation: |3x - 81| = 3

3. Solve the equation when 3x - 81 is negative: 3x - 81 = 3

4. Add 81 to both sides of the equation: 3x - 81 + 81 = 3 + 81 3x = 84

5. Divide both sides of the equation by 3 to solve for x: 3x/3 = 84/3 x = 28

Therefore, the solution to the equation |3x - 81| + 19 = 3 is x = 28.

Please note that these solutions are based on the equations provided. If there are any additional constraints or information, please let me know, and I'll be happy to assist you further.