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Solve 9x + 9 = 0

The solution of 9x + 9 = 0 is x = -1.

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The lines y = 9x + 9 and y = 0 meet at x = -1-6-4-224-60-40-20204060x = -1y = 9x + 9y = 0
The lines y = 9x + 9 and y = 0 meet at x = -1. The solution of the equation is the x-coordinate of the point where the two sides are equal.

How to work it out

  1. 1

    The goal is to get x alone. Undo the operations in the opposite order: first the addition, then the multiplication.

    9x+9=09x + 9 = 0
  2. 2

    Subtract 9 from both sides:

    9x+9āˆ’9=0āˆ’9Ā ā‡’Ā 9x=āˆ’99x + 9 - 9 = 0 - 9 \ \Rightarrow\ 9x = -9
  3. 3

    Divide both sides by 9:

    9x9=āˆ’99Ā ā‡’Ā x=āˆ’1\frac{9x}{9} = \frac{-9}{9} \ \Rightarrow\ x = -1
  4. 4

    Check: put x = -1 back into the equation.

    9ā‹…(āˆ’1)+9=āˆ’9+9=0āœ“9\cdot(-1) + 9 = -9 + 9 = 0 \checkmark
LaTeX source of the formulas on this page
\[ 9x + 9 = 0\ \Rightarrow\ x = -1 \]
\[ 9x + 9 = 0 \]
\[ 9x + 9 - 9 = 0 - 9 \ \Rightarrow\ 9x = -9 \]
\[ \frac{9x}{9} = \frac{-9}{9} \ \Rightarrow\ x = -1 \]
\[ 9\cdot(-1) + 9 = -9 + 9 = 0 \checkmark \]

Trying values of x in 9x + 9 = 0

x9x + 9Equals 0?
-3-18no
-2-9no
-10yes
09no
118no

Questions

What is x in 9x + 9 = 0?

The solution of 9x + 9 = 0 is x = -1.

How do you solve 9x + 9 = 0?

Subtract 9 from both sides to get 9x = -9, then divide both sides by 9 to get x = -1.

How do I check the answer?

Replace x by -1: 9(-1) + 9 = 0, which is 0.

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