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Solve 10x + 9 = 159

The solution of 10x + 9 = 159 is x = 15.

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The lines y = 10x + 9 and y = 159 meet at x = 15101214161820100120140160180200220x = 15y = 10x + 9y = 159
The lines y = 10x + 9 and y = 159 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.

    10x+9=15910x + 9 = 159
  2. 2

    Subtract 9 from both sides:

    10x+9−9=159−9 ⇒ 10x=15010x + 9 - 9 = 159 - 9 \ \Rightarrow\ 10x = 150
  3. 3

    Divide both sides by 10:

    10x10=15010 ⇒ x=15\frac{10x}{10} = \frac{150}{10} \ \Rightarrow\ x = 15
  4. 4

    Check: put x = 15 back into the equation.

    10⋅15+9=150+9=159✓10\cdot15 + 9 = 150 + 9 = 159 \checkmark
LaTeX source of the formulas on this page
\[ 10x + 9 = 159\ \Rightarrow\ x = 15 \]
\[ 10x + 9 = 159 \]
\[ 10x + 9 - 9 = 159 - 9 \ \Rightarrow\ 10x = 150 \]
\[ \frac{10x}{10} = \frac{150}{10} \ \Rightarrow\ x = 15 \]
\[ 10\cdot15 + 9 = 150 + 9 = 159 \checkmark \]

Trying values of x in 10x + 9 = 159

x10x + 9Equals 159?
13139no
14149no
15159yes
16169no
17179no

Questions

What is x in 10x + 9 = 159?

The solution of 10x + 9 = 159 is x = 15.

How do you solve 10x + 9 = 159?

Subtract 9 from both sides to get 10x = 150, then divide both sides by 10 to get x = 15.

How do I check the answer?

Replace x by 15: 10(15) + 9 = 159, which is 159.

Similar equations

    Solve 10x + 9 = 159: x = 15 (steps and check) | WordGPT