Write an equation and solve for the unknown number. Twice a number, increase by 3 is 7?
1.the number is 2
2. the number is 8
3. the number is 20
4. the number is 5
Let's denote the unknown number as "x".
The equation can be expressed as:
2x + 3 = 7
To solve for x, we will isolate it on one side of the equation:
2x + 3 - 3 = 7 - 3
2x = 4
Next, we divide both sides of the equation by 2:
2x/2 = 4/2
x = 2
Therefore, the unknown number is 2.