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Solve 2x + 8 = 16

The solution of 2x + 8 = 16 is x = 4.

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The lines y = 2x + 8 and y = 16 meet at x = 4-224681051015202530x = 4y = 2x + 8y = 16
The lines y = 2x + 8 and y = 16 meet at x = 4. 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=162x + 8 = 16
  2. 2

    Subtract 8 from both sides:

    2x+8−8=16−8 ⇒ 2x=82x + 8 - 8 = 16 - 8 \ \Rightarrow\ 2x = 8
  3. 3

    Divide both sides by 2:

    2x2=82 ⇒ x=4\frac{2x}{2} = \frac{8}{2} \ \Rightarrow\ x = 4
  4. 4

    Check: put x = 4 back into the equation.

    2⋅4+8=8+8=16✓2\cdot4 + 8 = 8 + 8 = 16 \checkmark
LaTeX source of the formulas on this page
\[ 2x + 8 = 16\ \Rightarrow\ x = 4 \]
\[ 2x + 8 = 16 \]
\[ 2x + 8 - 8 = 16 - 8 \ \Rightarrow\ 2x = 8 \]
\[ \frac{2x}{2} = \frac{8}{2} \ \Rightarrow\ x = 4 \]
\[ 2\cdot4 + 8 = 8 + 8 = 16 \checkmark \]

Trying values of x in 2x + 8 = 16

x2x + 8Equals 16?
212no
314no
416yes
518no
620no

Questions

What is x in 2x + 8 = 16?

The solution of 2x + 8 = 16 is x = 4.

How do you solve 2x + 8 = 16?

Subtract 8 from both sides to get 2x = 8, then divide both sides by 2 to get x = 4.

How do I check the answer?

Replace x by 4: 2(4) + 8 = 16, which is 16.

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    Solve 2x + 8 = 16: x = 4 (steps and check) | WordGPT