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Solve 9x + 12 = 21

The solution of 9x + 12 = 21 is x = 1.

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The lines y = 9x + 12 and y = 21 meet at x = 1-4-2246-40-2020406080x = 1y = 9x + 12y = 21
The lines y = 9x + 12 and y = 21 meet at x = 1. 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+12=219x + 12 = 21
  2. 2

    Subtract 12 from both sides:

    9x+12−12=21−12 ⇒ 9x=99x + 12 - 12 = 21 - 12 \ \Rightarrow\ 9x = 9
  3. 3

    Divide both sides by 9:

    9x9=99 ⇒ x=1\frac{9x}{9} = \frac{9}{9} \ \Rightarrow\ x = 1
  4. 4

    Check: put x = 1 back into the equation.

    9⋅1+12=9+12=21✓9\cdot1 + 12 = 9 + 12 = 21 \checkmark
LaTeX source of the formulas on this page
\[ 9x + 12 = 21\ \Rightarrow\ x = 1 \]
\[ 9x + 12 = 21 \]
\[ 9x + 12 - 12 = 21 - 12 \ \Rightarrow\ 9x = 9 \]
\[ \frac{9x}{9} = \frac{9}{9} \ \Rightarrow\ x = 1 \]
\[ 9\cdot1 + 12 = 9 + 12 = 21 \checkmark \]

Trying values of x in 9x + 12 = 21

x9x + 12Equals 21?
-13no
012no
121yes
230no
339no

Questions

What is x in 9x + 12 = 21?

The solution of 9x + 12 = 21 is x = 1.

How do you solve 9x + 12 = 21?

Subtract 12 from both sides to get 9x = 9, then divide both sides by 9 to get x = 1.

How do I check the answer?

Replace x by 1: 9(1) + 12 = 21, which is 21.

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    Solve 9x + 12 = 21: x = 1 (steps and check) | WordGPT