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Solve 9x + 4 = 166

The solution of 9x + 4 = 166 is x = 18.

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The lines y = 9x + 4 and y = 166 meet at x = 1812141618202224120140160180200220x = 18y = 9x + 4y = 166
The lines y = 9x + 4 and y = 166 meet at x = 18. 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=1669x + 4 = 166
  2. 2

    Subtract 4 from both sides:

    9x+4−4=166−4 ⇒ 9x=1629x + 4 - 4 = 166 - 4 \ \Rightarrow\ 9x = 162
  3. 3

    Divide both sides by 9:

    9x9=1629 ⇒ x=18\frac{9x}{9} = \frac{162}{9} \ \Rightarrow\ x = 18
  4. 4

    Check: put x = 18 back into the equation.

    9⋅18+4=162+4=166✓9\cdot18 + 4 = 162 + 4 = 166 \checkmark
LaTeX source of the formulas on this page
\[ 9x + 4 = 166\ \Rightarrow\ x = 18 \]
\[ 9x + 4 = 166 \]
\[ 9x + 4 - 4 = 166 - 4 \ \Rightarrow\ 9x = 162 \]
\[ \frac{9x}{9} = \frac{162}{9} \ \Rightarrow\ x = 18 \]
\[ 9\cdot18 + 4 = 162 + 4 = 166 \checkmark \]

Trying values of x in 9x + 4 = 166

x9x + 4Equals 166?
16148no
17157no
18166yes
19175no
20184no

Questions

What is x in 9x + 4 = 166?

The solution of 9x + 4 = 166 is x = 18.

How do you solve 9x + 4 = 166?

Subtract 4 from both sides to get 9x = 162, then divide both sides by 9 to get x = 18.

How do I check the answer?

Replace x by 18: 9(18) + 4 = 166, which is 166.

Similar equations

    Solve 9x + 4 = 166: x = 18 (steps and check) | WordGPT