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Solve 10x + 9 = 149

The solution of 10x + 9 = 149 is x = 14.

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The lines y = 10x + 9 and y = 149 meet at x = 14810121416182080100120140160180200220x = 14y = 10x + 9y = 149
The lines y = 10x + 9 and y = 149 meet at x = 14. 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.

    10x+9=14910x + 9 = 149
  2. 2

    Subtract 9 from both sides:

    10x+9−9=149−9 ⇒ 10x=14010x + 9 - 9 = 149 - 9 \ \Rightarrow\ 10x = 140
  3. 3

    Divide both sides by 10:

    10x10=14010 ⇒ x=14\frac{10x}{10} = \frac{140}{10} \ \Rightarrow\ x = 14
  4. 4

    Check: put x = 14 back into the equation.

    10⋅14+9=140+9=149✓10\cdot14 + 9 = 140 + 9 = 149 \checkmark
LaTeX source of the formulas on this page
\[ 10x + 9 = 149\ \Rightarrow\ x = 14 \]
\[ 10x + 9 = 149 \]
\[ 10x + 9 - 9 = 149 - 9 \ \Rightarrow\ 10x = 140 \]
\[ \frac{10x}{10} = \frac{140}{10} \ \Rightarrow\ x = 14 \]
\[ 10\cdot14 + 9 = 140 + 9 = 149 \checkmark \]

Trying values of x in 10x + 9 = 149

x10x + 9Equals 149?
12129no
13139no
14149yes
15159no
16169no

Questions

What is x in 10x + 9 = 149?

The solution of 10x + 9 = 149 is x = 14.

How do you solve 10x + 9 = 149?

Subtract 9 from both sides to get 10x = 140, then divide both sides by 10 to get x = 14.

How do I check the answer?

Replace x by 14: 10(14) + 9 = 149, which is 149.

Similar equations

    Solve 10x + 9 = 149: x = 14 (steps and check) | WordGPT