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Solve 2x + 8 = 18

The solution of 2x + 8 = 18 is x = 5.

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The lines y = 2x + 8 and y = 18 meet at x = 524681051015202530x = 5y = 2x + 8y = 18
The lines y = 2x + 8 and y = 18 meet at x = 5. 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.

    2x+8=182x + 8 = 18
  2. 2

    Subtract 8 from both sides:

    2x+8−8=18−8 ⇒ 2x=102x + 8 - 8 = 18 - 8 \ \Rightarrow\ 2x = 10
  3. 3

    Divide both sides by 2:

    2x2=102 ⇒ x=5\frac{2x}{2} = \frac{10}{2} \ \Rightarrow\ x = 5
  4. 4

    Check: put x = 5 back into the equation.

    2⋅5+8=10+8=18✓2\cdot5 + 8 = 10 + 8 = 18 \checkmark
LaTeX source of the formulas on this page
\[ 2x + 8 = 18\ \Rightarrow\ x = 5 \]
\[ 2x + 8 = 18 \]
\[ 2x + 8 - 8 = 18 - 8 \ \Rightarrow\ 2x = 10 \]
\[ \frac{2x}{2} = \frac{10}{2} \ \Rightarrow\ x = 5 \]
\[ 2\cdot5 + 8 = 10 + 8 = 18 \checkmark \]

Trying values of x in 2x + 8 = 18

x2x + 8Equals 18?
314no
416no
518yes
620no
722no

Questions

What is x in 2x + 8 = 18?

The solution of 2x + 8 = 18 is x = 5.

How do you solve 2x + 8 = 18?

Subtract 8 from both sides to get 2x = 10, then divide both sides by 2 to get x = 5.

How do I check the answer?

Replace x by 5: 2(5) + 8 = 18, which is 18.

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    Solve 2x + 8 = 18: x = 5 (steps and check) | WordGPT