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Solve 11x + 4 = 81

The solution of 11x + 4 = 81 is x = 7.

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The lines y = 11x + 4 and y = 81 meet at x = 72468101220406080100120140160x = 7y = 11x + 4y = 81
The lines y = 11x + 4 and y = 81 meet at x = 7. 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.

    11x+4=8111x + 4 = 81
  2. 2

    Subtract 4 from both sides:

    11x+4−4=81−4 ⇒ 11x=7711x + 4 - 4 = 81 - 4 \ \Rightarrow\ 11x = 77
  3. 3

    Divide both sides by 11:

    11x11=7711 ⇒ x=7\frac{11x}{11} = \frac{77}{11} \ \Rightarrow\ x = 7
  4. 4

    Check: put x = 7 back into the equation.

    11⋅7+4=77+4=81✓11\cdot7 + 4 = 77 + 4 = 81 \checkmark
LaTeX source of the formulas on this page
\[ 11x + 4 = 81\ \Rightarrow\ x = 7 \]
\[ 11x + 4 = 81 \]
\[ 11x + 4 - 4 = 81 - 4 \ \Rightarrow\ 11x = 77 \]
\[ \frac{11x}{11} = \frac{77}{11} \ \Rightarrow\ x = 7 \]
\[ 11\cdot7 + 4 = 77 + 4 = 81 \checkmark \]

Trying values of x in 11x + 4 = 81

x11x + 4Equals 81?
559no
670no
781yes
892no
9103no

Questions

What is x in 11x + 4 = 81?

The solution of 11x + 4 = 81 is x = 7.

How do you solve 11x + 4 = 81?

Subtract 4 from both sides to get 11x = 77, then divide both sides by 11 to get x = 7.

How do I check the answer?

Replace x by 7: 11(7) + 4 = 81, which is 81.

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    Solve 11x + 4 = 81: x = 7 (steps and check) | WordGPT