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Solve 8x + 3 = 139

The solution of 8x + 3 = 139 is x = 17.

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The lines y = 8x + 3 and y = 139 meet at x = 17121416182022100120140160180x = 17y = 8x + 3y = 139
The lines y = 8x + 3 and y = 139 meet at x = 17. 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+3=1398x + 3 = 139
  2. 2

    Subtract 3 from both sides:

    8x+3−3=139−3 ⇒ 8x=1368x + 3 - 3 = 139 - 3 \ \Rightarrow\ 8x = 136
  3. 3

    Divide both sides by 8:

    8x8=1368 ⇒ x=17\frac{8x}{8} = \frac{136}{8} \ \Rightarrow\ x = 17
  4. 4

    Check: put x = 17 back into the equation.

    8⋅17+3=136+3=139✓8\cdot17 + 3 = 136 + 3 = 139 \checkmark
LaTeX source of the formulas on this page
\[ 8x + 3 = 139\ \Rightarrow\ x = 17 \]
\[ 8x + 3 = 139 \]
\[ 8x + 3 - 3 = 139 - 3 \ \Rightarrow\ 8x = 136 \]
\[ \frac{8x}{8} = \frac{136}{8} \ \Rightarrow\ x = 17 \]
\[ 8\cdot17 + 3 = 136 + 3 = 139 \checkmark \]

Trying values of x in 8x + 3 = 139

x8x + 3Equals 139?
15123no
16131no
17139yes
18147no
19155no

Questions

What is x in 8x + 3 = 139?

The solution of 8x + 3 = 139 is x = 17.

How do you solve 8x + 3 = 139?

Subtract 3 from both sides to get 8x = 136, then divide both sides by 8 to get x = 17.

How do I check the answer?

Replace x by 17: 8(17) + 3 = 139, which is 139.

Similar equations

    Solve 8x + 3 = 139: x = 17 (steps and check) | WordGPT