Question

What should be done to solve the following equation?

d - 8 = 9

Subtract 8 from both sides of the equation.
Add 8 to both sides of the equation.
Add 9 to both sides of the equation.
Subtract 9 from both sides of the equation.

Answer 1

Answer: Add 8 to both sides of the equation

Explanation:

d - 8 = 9

in this equation you need to solve for d. To do that you have to get d by itself.

By adding 8 to both sides of the equation you cancel out the -8 and add 8 to 9 which solves for d.

Answer 2

Add 8 to both sides of the equation.

You need to get x by itself. The only way to do that here is to do the opposite of subtracting 8, which is adding 8.

Also, when you do something to one side of the equation, you have to also do it to the other side to keep the equation equal.