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Solve 8x + 11 = 99

The solution of 8x + 11 = 99 is x = 11.

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The lines y = 8x + 11 and y = 99 meet at x = 1168101214166080100120140x = 11y = 8x + 11y = 99
The lines y = 8x + 11 and y = 99 meet at x = 11. 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=998x + 11 = 99
  2. 2

    Subtract 11 from both sides:

    8x+11−11=99−11 ⇒ 8x=888x + 11 - 11 = 99 - 11 \ \Rightarrow\ 8x = 88
  3. 3

    Divide both sides by 8:

    8x8=888 ⇒ x=11\frac{8x}{8} = \frac{88}{8} \ \Rightarrow\ x = 11
  4. 4

    Check: put x = 11 back into the equation.

    8⋅11+11=88+11=99✓8\cdot11 + 11 = 88 + 11 = 99 \checkmark
LaTeX source of the formulas on this page
\[ 8x + 11 = 99\ \Rightarrow\ x = 11 \]
\[ 8x + 11 = 99 \]
\[ 8x + 11 - 11 = 99 - 11 \ \Rightarrow\ 8x = 88 \]
\[ \frac{8x}{8} = \frac{88}{8} \ \Rightarrow\ x = 11 \]
\[ 8\cdot11 + 11 = 88 + 11 = 99 \checkmark \]

Trying values of x in 8x + 11 = 99

x8x + 11Equals 99?
983no
1091no
1199yes
12107no
13115no

Questions

What is x in 8x + 11 = 99?

The solution of 8x + 11 = 99 is x = 11.

How do you solve 8x + 11 = 99?

Subtract 11 from both sides to get 8x = 88, then divide both sides by 8 to get x = 11.

How do I check the answer?

Replace x by 11: 8(11) + 11 = 99, which is 99.

Similar equations

    Solve 8x + 11 = 99: x = 11 (steps and check) | WordGPT