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Solve 5x + 11 = 81

The solution of 5x + 11 = 81 is x = 14.

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The lines y = 5x + 11 and y = 81 meet at x = 1481012141618205060708090100110x = 14y = 5x + 11y = 81
The lines y = 5x + 11 and y = 81 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.

    5x+11=815x + 11 = 81
  2. 2

    Subtract 11 from both sides:

    5x+11−11=81−11 ⇒ 5x=705x + 11 - 11 = 81 - 11 \ \Rightarrow\ 5x = 70
  3. 3

    Divide both sides by 5:

    5x5=705 ⇒ x=14\frac{5x}{5} = \frac{70}{5} \ \Rightarrow\ x = 14
  4. 4

    Check: put x = 14 back into the equation.

    5⋅14+11=70+11=81✓5\cdot14 + 11 = 70 + 11 = 81 \checkmark
LaTeX source of the formulas on this page
\[ 5x + 11 = 81\ \Rightarrow\ x = 14 \]
\[ 5x + 11 = 81 \]
\[ 5x + 11 - 11 = 81 - 11 \ \Rightarrow\ 5x = 70 \]
\[ \frac{5x}{5} = \frac{70}{5} \ \Rightarrow\ x = 14 \]
\[ 5\cdot14 + 11 = 70 + 11 = 81 \checkmark \]

Trying values of x in 5x + 11 = 81

x5x + 11Equals 81?
1271no
1376no
1481yes
1586no
1691no

Questions

What is x in 5x + 11 = 81?

The solution of 5x + 11 = 81 is x = 14.

How do you solve 5x + 11 = 81?

Subtract 11 from both sides to get 5x = 70, then divide both sides by 5 to get x = 14.

How do I check the answer?

Replace x by 14: 5(14) + 11 = 81, which is 81.

Similar equations

    Solve 5x + 11 = 81: x = 14 (steps and check) | WordGPT