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Solve 8x + 8 = 40

The solution of 8x + 8 = 40 is x = 4.

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The lines y = 8x + 8 and y = 40 meet at x = 4-224681020406080x = 4y = 8x + 8y = 40
The lines y = 8x + 8 and y = 40 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.

    8x+8=408x + 8 = 40
  2. 2

    Subtract 8 from both sides:

    8x+8−8=40−8 ⇒ 8x=328x + 8 - 8 = 40 - 8 \ \Rightarrow\ 8x = 32
  3. 3

    Divide both sides by 8:

    8x8=328 ⇒ x=4\frac{8x}{8} = \frac{32}{8} \ \Rightarrow\ x = 4
  4. 4

    Check: put x = 4 back into the equation.

    8⋅4+8=32+8=40✓8\cdot4 + 8 = 32 + 8 = 40 \checkmark
LaTeX source of the formulas on this page
\[ 8x + 8 = 40\ \Rightarrow\ x = 4 \]
\[ 8x + 8 = 40 \]
\[ 8x + 8 - 8 = 40 - 8 \ \Rightarrow\ 8x = 32 \]
\[ \frac{8x}{8} = \frac{32}{8} \ \Rightarrow\ x = 4 \]
\[ 8\cdot4 + 8 = 32 + 8 = 40 \checkmark \]

Trying values of x in 8x + 8 = 40

x8x + 8Equals 40?
224no
332no
440yes
548no
656no

Questions

What is x in 8x + 8 = 40?

The solution of 8x + 8 = 40 is x = 4.

How do you solve 8x + 8 = 40?

Subtract 8 from both sides to get 8x = 32, then divide both sides by 8 to get x = 4.

How do I check the answer?

Replace x by 4: 8(4) + 8 = 40, which is 40.

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    Solve 8x + 8 = 40: x = 4 (steps and check) | WordGPT