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Solve 2x + 4 = 18

The solution of 2x + 4 = 18 is x = 7.

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The lines y = 2x + 4 and y = 18 meet at x = 72468101251015202530x = 7y = 2x + 4y = 18
The lines y = 2x + 4 and y = 18 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.

    2x+4=182x + 4 = 18
  2. 2

    Subtract 4 from both sides:

    2x+4−4=18−4 ⇒ 2x=142x + 4 - 4 = 18 - 4 \ \Rightarrow\ 2x = 14
  3. 3

    Divide both sides by 2:

    2x2=142 ⇒ x=7\frac{2x}{2} = \frac{14}{2} \ \Rightarrow\ x = 7
  4. 4

    Check: put x = 7 back into the equation.

    2⋅7+4=14+4=18✓2\cdot7 + 4 = 14 + 4 = 18 \checkmark
LaTeX source of the formulas on this page
\[ 2x + 4 = 18\ \Rightarrow\ x = 7 \]
\[ 2x + 4 = 18 \]
\[ 2x + 4 - 4 = 18 - 4 \ \Rightarrow\ 2x = 14 \]
\[ \frac{2x}{2} = \frac{14}{2} \ \Rightarrow\ x = 7 \]
\[ 2\cdot7 + 4 = 14 + 4 = 18 \checkmark \]

Trying values of x in 2x + 4 = 18

x2x + 4Equals 18?
514no
616no
718yes
820no
922no

Questions

What is x in 2x + 4 = 18?

The solution of 2x + 4 = 18 is x = 7.

How do you solve 2x + 4 = 18?

Subtract 4 from both sides to get 2x = 14, then divide both sides by 2 to get x = 7.

How do I check the answer?

Replace x by 7: 2(7) + 4 = 18, which is 18.

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    Solve 2x + 4 = 18: x = 7 (steps and check) | WordGPT