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Solve 9x + 13 = 121

The solution of 9x + 13 = 121 is x = 12.

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The lines y = 9x + 13 and y = 121 meet at x = 126810121416186080100120140160180x = 12y = 9x + 13y = 121
The lines y = 9x + 13 and y = 121 meet at x = 12. 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+13=1219x + 13 = 121
  2. 2

    Subtract 13 from both sides:

    9x+13−13=121−13 ⇒ 9x=1089x + 13 - 13 = 121 - 13 \ \Rightarrow\ 9x = 108
  3. 3

    Divide both sides by 9:

    9x9=1089 ⇒ x=12\frac{9x}{9} = \frac{108}{9} \ \Rightarrow\ x = 12
  4. 4

    Check: put x = 12 back into the equation.

    9⋅12+13=108+13=121✓9\cdot12 + 13 = 108 + 13 = 121 \checkmark
LaTeX source of the formulas on this page
\[ 9x + 13 = 121\ \Rightarrow\ x = 12 \]
\[ 9x + 13 = 121 \]
\[ 9x + 13 - 13 = 121 - 13 \ \Rightarrow\ 9x = 108 \]
\[ \frac{9x}{9} = \frac{108}{9} \ \Rightarrow\ x = 12 \]
\[ 9\cdot12 + 13 = 108 + 13 = 121 \checkmark \]

Trying values of x in 9x + 13 = 121

x9x + 13Equals 121?
10103no
11112no
12121yes
13130no
14139no

Questions

What is x in 9x + 13 = 121?

The solution of 9x + 13 = 121 is x = 12.

How do you solve 9x + 13 = 121?

Subtract 13 from both sides to get 9x = 108, then divide both sides by 9 to get x = 12.

How do I check the answer?

Replace x by 12: 9(12) + 13 = 121, which is 121.

Similar equations

    Solve 9x + 13 = 121: x = 12 (steps and check) | WordGPT