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Solve 9x + 9 = 108

The solution of 9x + 9 = 108 is x = 11.

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The lines y = 9x + 9 and y = 108 meet at x = 1168101214166080100120140160x = 11y = 9x + 9y = 108
The lines y = 9x + 9 and y = 108 meet at x = 11. 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=1089x + 9 = 108
  2. 2

    Subtract 9 from both sides:

    9x+9−9=108−9 ⇒ 9x=999x + 9 - 9 = 108 - 9 \ \Rightarrow\ 9x = 99
  3. 3

    Divide both sides by 9:

    9x9=999 ⇒ x=11\frac{9x}{9} = \frac{99}{9} \ \Rightarrow\ x = 11
  4. 4

    Check: put x = 11 back into the equation.

    9⋅11+9=99+9=108✓9\cdot11 + 9 = 99 + 9 = 108 \checkmark
LaTeX source of the formulas on this page
\[ 9x + 9 = 108\ \Rightarrow\ x = 11 \]
\[ 9x + 9 = 108 \]
\[ 9x + 9 - 9 = 108 - 9 \ \Rightarrow\ 9x = 99 \]
\[ \frac{9x}{9} = \frac{99}{9} \ \Rightarrow\ x = 11 \]
\[ 9\cdot11 + 9 = 99 + 9 = 108 \checkmark \]

Trying values of x in 9x + 9 = 108

x9x + 9Equals 108?
990no
1099no
11108yes
12117no
13126no

Questions

What is x in 9x + 9 = 108?

The solution of 9x + 9 = 108 is x = 11.

How do you solve 9x + 9 = 108?

Subtract 9 from both sides to get 9x = 99, then divide both sides by 9 to get x = 11.

How do I check the answer?

Replace x by 11: 9(11) + 9 = 108, which is 108.

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    Solve 9x + 9 = 108: x = 11 (steps and check) | WordGPT