Question

решите уравнения.2x-15=13       7y-25=45              9y-8g=55                  130-4x=70             74-8z=2 49-3x=34    

Answer 1

1)2x-15=13 , 2x=13+15, 2x=28, x=14

2) 7y-25=45,  7y=45+25, 7y=70 , y=10

3) 130-4x=70 , -4x=70-130, 4x= 60, x=15

4) 74- 8z=2,  -8z= 2-74, 8z=72 , z=9

5) 49-3x=34, -3x=34-49, 3x=15, x=5

9y-8g=55 - тут,скорее всего,ошибка в уравнении.

Answer 2

To solve each equation, we need to isolate the variable on one side of the equal sign. Let's solve each equation step by step:

1. 2x - 15 = 13 Add 15 to both sides: 2x = 13 + 15 2x = 28 Divide both sides by 2: x = 28 / 2 x = 14

2. 7y - 25 = 45 Add 25 to both sides: 7y = 45 + 25 7y = 70 Divide both sides by 7: y = 70 / 7 y = 10

3. 9y - 8g = 55 There are two variables (y and g), and we can't solve for both variables without additional information or equations.

4. 130 - 4x = 70 Subtract 130 from both sides: -4x = 70 - 130 -4x = -60 Divide both sides by -4: x = -60 / -4 x = 15

5. 74 - 8z = 249 Subtract 74 from both sides: -8z = 249 - 74 -8z = 175 Divide both sides by -8: z = 175 / -8 z ≈ -21.875

6. 49 - 3x = 34 Subtract 49 from both sides: -3x = 34 - 49 -3x = -15 Divide both sides by -3: x = -15 / -3 x = 5

To summarize the solutions: x = 14 y = 10 g = Cannot be determined without more information or equations x = 15 z ≈ -21.875 x = 5