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Solve 3x + 9 = 15

The solution of 3x + 9 = 15 is x = 2.

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The lines y = 3x + 9 and y = 15 meet at x = 2-4-22468-55101520253035x = 2y = 3x + 9y = 15
The lines y = 3x + 9 and y = 15 meet at x = 2. 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.

    3x+9=153x + 9 = 15
  2. 2

    Subtract 9 from both sides:

    3x+9−9=15−9 ⇒ 3x=63x + 9 - 9 = 15 - 9 \ \Rightarrow\ 3x = 6
  3. 3

    Divide both sides by 3:

    3x3=63 ⇒ x=2\frac{3x}{3} = \frac{6}{3} \ \Rightarrow\ x = 2
  4. 4

    Check: put x = 2 back into the equation.

    3⋅2+9=6+9=15✓3\cdot2 + 9 = 6 + 9 = 15 \checkmark
LaTeX source of the formulas on this page
\[ 3x + 9 = 15\ \Rightarrow\ x = 2 \]
\[ 3x + 9 = 15 \]
\[ 3x + 9 - 9 = 15 - 9 \ \Rightarrow\ 3x = 6 \]
\[ \frac{3x}{3} = \frac{6}{3} \ \Rightarrow\ x = 2 \]
\[ 3\cdot2 + 9 = 6 + 9 = 15 \checkmark \]

Trying values of x in 3x + 9 = 15

x3x + 9Equals 15?
09no
112no
215yes
318no
421no

Questions

What is x in 3x + 9 = 15?

The solution of 3x + 9 = 15 is x = 2.

How do you solve 3x + 9 = 15?

Subtract 9 from both sides to get 3x = 6, then divide both sides by 3 to get x = 2.

How do I check the answer?

Replace x by 2: 3(2) + 9 = 15, which is 15.

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    Solve 3x + 9 = 15: x = 2 (steps and check) | WordGPT