WordGPT

Solve 12x + 15 = 99

The solution of 12x + 15 = 99 is x = 7.

Explain it step by step in chatMake a short video of it
The lines y = 12x + 15 and y = 99 meet at x = 72468101220406080100120140160180x = 7y = 12x + 15y = 99
The lines y = 12x + 15 and y = 99 meet at x = 7. 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.

    12x+15=9912x + 15 = 99
  2. 2

    Subtract 15 from both sides:

    12x+15−15=99−15 ⇒ 12x=8412x + 15 - 15 = 99 - 15 \ \Rightarrow\ 12x = 84
  3. 3

    Divide both sides by 12:

    12x12=8412 ⇒ x=7\frac{12x}{12} = \frac{84}{12} \ \Rightarrow\ x = 7
  4. 4

    Check: put x = 7 back into the equation.

    12⋅7+15=84+15=99✓12\cdot7 + 15 = 84 + 15 = 99 \checkmark
LaTeX source of the formulas on this page
\[ 12x + 15 = 99\ \Rightarrow\ x = 7 \]
\[ 12x + 15 = 99 \]
\[ 12x + 15 - 15 = 99 - 15 \ \Rightarrow\ 12x = 84 \]
\[ \frac{12x}{12} = \frac{84}{12} \ \Rightarrow\ x = 7 \]
\[ 12\cdot7 + 15 = 84 + 15 = 99 \checkmark \]

Trying values of x in 12x + 15 = 99

x12x + 15Equals 99?
575no
687no
799yes
8111no
9123no

Questions

What is x in 12x + 15 = 99?

The solution of 12x + 15 = 99 is x = 7.

How do you solve 12x + 15 = 99?

Subtract 15 from both sides to get 12x = 84, then divide both sides by 12 to get x = 7.

How do I check the answer?

Replace x by 7: 12(7) + 15 = 99, which is 99.

Similar equations

    Solve 12x + 15 = 99: x = 7 (steps and check) | WordGPT