Question

Solve the equation. 9 = –d + 17

Answer 1

8

Explanation:

`9= -d +17\\9-17= -d +17- 17 \\-8/-1 = -d/-1\\8 = d`

Answer 2

d = 8

Explanation:

Since the variable appears on only one side of the equation, all terms not containing the variable can be eliminated from that side by adding their opposite to both sides of the equation. That is, add -17 to both sides of the equation:

9 -17 = -d + 17 - 17

-8 = -d . . . . . simplify

Now, the equation can be multiplied by a number that will give "d" on one side of the equation. Here, that number is -1. Multiply both sides of the equation by -1:

(-1)(-8) = (-1)(-d)

8 = d . . . . . simplify

The solution is d = 8.