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Solve 8x + 11 = 123

The solution of 8x + 11 = 123 is x = 14.

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The lines y = 8x + 11 and y = 123 meet at x = 14810121416182080100120140160180x = 14y = 8x + 11y = 123
The lines y = 8x + 11 and y = 123 meet at x = 14. 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.

    8x+11=1238x + 11 = 123
  2. 2

    Subtract 11 from both sides:

    8x+11−11=123−11 ⇒ 8x=1128x + 11 - 11 = 123 - 11 \ \Rightarrow\ 8x = 112
  3. 3

    Divide both sides by 8:

    8x8=1128 ⇒ x=14\frac{8x}{8} = \frac{112}{8} \ \Rightarrow\ x = 14
  4. 4

    Check: put x = 14 back into the equation.

    8⋅14+11=112+11=123✓8\cdot14 + 11 = 112 + 11 = 123 \checkmark
LaTeX source of the formulas on this page
\[ 8x + 11 = 123\ \Rightarrow\ x = 14 \]
\[ 8x + 11 = 123 \]
\[ 8x + 11 - 11 = 123 - 11 \ \Rightarrow\ 8x = 112 \]
\[ \frac{8x}{8} = \frac{112}{8} \ \Rightarrow\ x = 14 \]
\[ 8\cdot14 + 11 = 112 + 11 = 123 \checkmark \]

Trying values of x in 8x + 11 = 123

x8x + 11Equals 123?
12107no
13115no
14123yes
15131no
16139no

Questions

What is x in 8x + 11 = 123?

The solution of 8x + 11 = 123 is x = 14.

How do you solve 8x + 11 = 123?

Subtract 11 from both sides to get 8x = 112, then divide both sides by 8 to get x = 14.

How do I check the answer?

Replace x by 14: 8(14) + 11 = 123, which is 123.

Similar equations

    Solve 8x + 11 = 123: x = 14 (steps and check) | WordGPT