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Solve 10x + 9 = 199

The solution of 10x + 9 = 199 is x = 19.

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The lines y = 10x + 9 and y = 199 meet at x = 19141618202224140160180200220240260x = 19y = 10x + 9y = 199
The lines y = 10x + 9 and y = 199 meet at x = 19. 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=19910x + 9 = 199
  2. 2

    Subtract 9 from both sides:

    10x+9−9=199−9 ⇒ 10x=19010x + 9 - 9 = 199 - 9 \ \Rightarrow\ 10x = 190
  3. 3

    Divide both sides by 10:

    10x10=19010 ⇒ x=19\frac{10x}{10} = \frac{190}{10} \ \Rightarrow\ x = 19
  4. 4

    Check: put x = 19 back into the equation.

    10⋅19+9=190+9=199✓10\cdot19 + 9 = 190 + 9 = 199 \checkmark
LaTeX source of the formulas on this page
\[ 10x + 9 = 199\ \Rightarrow\ x = 19 \]
\[ 10x + 9 = 199 \]
\[ 10x + 9 - 9 = 199 - 9 \ \Rightarrow\ 10x = 190 \]
\[ \frac{10x}{10} = \frac{190}{10} \ \Rightarrow\ x = 19 \]
\[ 10\cdot19 + 9 = 190 + 9 = 199 \checkmark \]

Trying values of x in 10x + 9 = 199

x10x + 9Equals 199?
17179no
18189no
19199yes
20209no
21219no

Questions

What is x in 10x + 9 = 199?

The solution of 10x + 9 = 199 is x = 19.

How do you solve 10x + 9 = 199?

Subtract 9 from both sides to get 10x = 190, then divide both sides by 10 to get x = 19.

How do I check the answer?

Replace x by 19: 10(19) + 9 = 199, which is 199.

Similar equations

    Solve 10x + 9 = 199: x = 19 (steps and check) | WordGPT