Question

2x--1,8(x-3)=-3,2 второй 7-2b при b=-1; 3;

Answer 1

2x-1,8(x-3)=-3,2
2x-1,8x+5,4=-3,2
2x-1,8x=-3,2-5,4
0,2x=-8,6
x=-43

7-2b
Если b=-1,то 7-2b=7-2×(-1)=7+2=9
Если b=3,то 7-2b=7-2×3=7-6=1

Answer 2

To solve the equations, let's start with the first one:

1. Solve for x in the equation: 2x - (-1) + 8(x - 3) = -3.

Step 1: Distribute the 8 on the left side: 2x + 1 + 8x - 24 = -3.

Step 2: Combine like terms: 10x - 23 = -3.

Step 3: Isolate x on one side: 10x = -3 + 23, 10x = 20.

Step 4: Divide by 10 to find the value of x: x = 20 / 10, x = 2.

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

2. Evaluate 7 - 2b for b = -1: 7 - 2(-1) = 7 + 2 = 9.

Now, evaluate 7 - 2b for b = 3: 7 - 2(3) = 7 - 6 = 1.

So, the value of 7 - 2b when b is -1 is 9, and when b is 3, it is 1.