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Solve 9x + 4 = 139

The solution of 9x + 4 = 139 is x = 15.

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The lines y = 9x + 4 and y = 139 meet at x = 1510121416182080100120140160180200x = 15y = 9x + 4y = 139
The lines y = 9x + 4 and y = 139 meet at x = 15. 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.

    9x+4=1399x + 4 = 139
  2. 2

    Subtract 4 from both sides:

    9x+4−4=139−4 ⇒ 9x=1359x + 4 - 4 = 139 - 4 \ \Rightarrow\ 9x = 135
  3. 3

    Divide both sides by 9:

    9x9=1359 ⇒ x=15\frac{9x}{9} = \frac{135}{9} \ \Rightarrow\ x = 15
  4. 4

    Check: put x = 15 back into the equation.

    9⋅15+4=135+4=139✓9\cdot15 + 4 = 135 + 4 = 139 \checkmark
LaTeX source of the formulas on this page
\[ 9x + 4 = 139\ \Rightarrow\ x = 15 \]
\[ 9x + 4 = 139 \]
\[ 9x + 4 - 4 = 139 - 4 \ \Rightarrow\ 9x = 135 \]
\[ \frac{9x}{9} = \frac{135}{9} \ \Rightarrow\ x = 15 \]
\[ 9\cdot15 + 4 = 135 + 4 = 139 \checkmark \]

Trying values of x in 9x + 4 = 139

x9x + 4Equals 139?
13121no
14130no
15139yes
16148no
17157no

Questions

What is x in 9x + 4 = 139?

The solution of 9x + 4 = 139 is x = 15.

How do you solve 9x + 4 = 139?

Subtract 4 from both sides to get 9x = 135, then divide both sides by 9 to get x = 15.

How do I check the answer?

Replace x by 15: 9(15) + 4 = 139, which is 139.

Similar equations

    Solve 9x + 4 = 139: x = 15 (steps and check) | WordGPT