WordGPT

Solve 3x + 12 = 9

The solution of 3x + 12 = 9 is x = -1.

Explain it step by step in chatMake a short video of it
The lines y = 3x + 12 and y = 9 meet at x = -1-6-4-224-10-551015202530x = -1y = 3x + 12y = 9
The lines y = 3x + 12 and y = 9 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.

    3x+12=93x + 12 = 9
  2. 2

    Subtract 12 from both sides:

    3x+12−12=9−12 ⇒ 3x=−33x + 12 - 12 = 9 - 12 \ \Rightarrow\ 3x = -3
  3. 3

    Divide both sides by 3:

    3x3=−33 ⇒ x=−1\frac{3x}{3} = \frac{-3}{3} \ \Rightarrow\ x = -1
  4. 4

    Check: put x = -1 back into the equation.

    3⋅(−1)+12=−3+12=9✓3\cdot(-1) + 12 = -3 + 12 = 9 \checkmark
LaTeX source of the formulas on this page
\[ 3x + 12 = 9\ \Rightarrow\ x = -1 \]
\[ 3x + 12 = 9 \]
\[ 3x + 12 - 12 = 9 - 12 \ \Rightarrow\ 3x = -3 \]
\[ \frac{3x}{3} = \frac{-3}{3} \ \Rightarrow\ x = -1 \]
\[ 3\cdot(-1) + 12 = -3 + 12 = 9 \checkmark \]

Trying values of x in 3x + 12 = 9

x3x + 12Equals 9?
-33no
-26no
-19yes
012no
115no

Questions

What is x in 3x + 12 = 9?

The solution of 3x + 12 = 9 is x = -1.

How do you solve 3x + 12 = 9?

Subtract 12 from both sides to get 3x = -3, then divide both sides by 3 to get x = -1.

How do I check the answer?

Replace x by -1: 3(-1) + 12 = 9, which is 9.

Similar equations

    Solve 3x + 12 = 9: x = -1 (steps and check) | WordGPT