When an equation is given a value we can solve it. e.g 4y + 16 = 10.
This means that when an unknown number (y) is multiplied by 4 and then 16 added it makes 10. You have to find y.
To work this out, do the SAME operations (e.g. adding or subtracting) to both sides of the equation to get only letters on one side of the equals sign and numbers on the other.
Get rid of the 16 by taking 16 away from the left. Make sure you do the same to the right side.
So we get 4y + 16 –16 = 10 –16.
This means 4y = –6.
Now divide both sides by 4 so we just get y on the left.
This means y = –4/6
- 2(x + 3) = 18
- 8 + x = 6 + 2x
- 8 + x = 6 + 6x