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Solve 5x + 11 = 91

The solution of 5x + 11 = 91 is x = 16.

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The lines y = 5x + 11 and y = 91 meet at x = 161012141618202260708090100110120x = 16y = 5x + 11y = 91
The lines y = 5x + 11 and y = 91 meet at x = 16. 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=915x + 11 = 91
  2. 2

    Subtract 11 from both sides:

    5x+11−11=91−11 ⇒ 5x=805x + 11 - 11 = 91 - 11 \ \Rightarrow\ 5x = 80
  3. 3

    Divide both sides by 5:

    5x5=805 ⇒ x=16\frac{5x}{5} = \frac{80}{5} \ \Rightarrow\ x = 16
  4. 4

    Check: put x = 16 back into the equation.

    5⋅16+11=80+11=91✓5\cdot16 + 11 = 80 + 11 = 91 \checkmark
LaTeX source of the formulas on this page
\[ 5x + 11 = 91\ \Rightarrow\ x = 16 \]
\[ 5x + 11 = 91 \]
\[ 5x + 11 - 11 = 91 - 11 \ \Rightarrow\ 5x = 80 \]
\[ \frac{5x}{5} = \frac{80}{5} \ \Rightarrow\ x = 16 \]
\[ 5\cdot16 + 11 = 80 + 11 = 91 \checkmark \]

Trying values of x in 5x + 11 = 91

x5x + 11Equals 91?
1481no
1586no
1691yes
1796no
18101no

Questions

What is x in 5x + 11 = 91?

The solution of 5x + 11 = 91 is x = 16.

How do you solve 5x + 11 = 91?

Subtract 11 from both sides to get 5x = 80, then divide both sides by 5 to get x = 16.

How do I check the answer?

Replace x by 16: 5(16) + 11 = 91, which is 91.

Similar equations

    Solve 5x + 11 = 91: x = 16 (steps and check) | WordGPT