Question

3х-х-4=5 , б) 12-(7у+5)=2​

Answer 1

Ответ:

a) 3x-x-4=5

2x-4=5

2x=5+4=9

x=9:2=4,5

3•4,5-4,5-4=5

Ответ: x=4,5

b) 12-(7y+5)=2

7y+5=12-2=10

7y=10-5=5

y=5/7

12-(7•5/7+5)=2

Ответ: y=5/7

Answer 2

Ответ:

3x-x-4=5

2x-4=5

2x=5+4

2x=9

X=9/2

Answer 3

To solve the given equations, we need to find the values of the variables $x$ and $y$ that satisfy each equation. Let's solve them step-by-step:

а) $3x - x - 4 = 5$

Step 1: Combine like terms on the left-hand side: $2x - 4 = 5$

Step 2: Move the constant term (-4) to the right-hand side by adding 4 to both sides: $2x = 5 + 4$ $2x = 9$

Step 3: Solve for $x$ by dividing both sides by 2: $x = \frac{9}{2}$ $x = 4.5$

So, the solution for $x$ is $4.5$.

б) $12 - (7y + 5) = 2$

Step 1: Simplify the expression inside the parentheses on the left-hand side: $12 - 7y - 5 = 2$

Step 2: Combine like terms on the left-hand side: $7 - 7y = 2$

Step 3: Move the constant term (7) to the right-hand side by subtracting 7 from both sides: $-7y = 2 - 7$ $-7y = -5$

Step 4: Solve for $y$ by dividing both sides by -7: $y = \frac{-5}{-7}$ $y = \frac{5}{7}$

So, the solution for $y$ is $\frac{5}{7}$.