Write three equations whose solution is x=3.5

1. 2x + 23 = 30 2. 3x + 19.5 = 30 3. (10x - 20) / 5 = 3

Explanation:

Work backward:

1. 2x + 23 = 30

Start:

x = 3.5

Multiply the equation by 2:

2x = 2 (3.5) 2x = 7

Subtract 30 from both sides

2x - 30 = 7 - 30 2x - 30 = - 23

Add 23 and 30 to both sides:

2x + 23 = 30

2. 3x + 19.5 = 30

Start:

x = 3.5

Add 6.5 to both sides:

x + 6.5 = 10

Multiply by 3:

3 (x + 6.5) = 30

Distributive property:

3x + 19.5 = 30

3. (10x - 20) / 5 = 3

Start:

x=3.5

Multiply by 10:

10x = 35

Subtract 20:

10x - 20 = 15

Divide by 5:

(10x - 20) / 5 = 15/5

(10x - 20) / 5 = 3