Solve 6x + 15 = 117
The solution of 6x + 15 = 117 is x = 17.
How to work it out
- 1
The goal is to get x alone. Undo the operations in the opposite order: first the addition, then the multiplication.
- 2
Subtract 15 from both sides:
- 3
Divide both sides by 6:
- 4
Check: put x = 17 back into the equation.
LaTeX source of the formulas on this page
\[ 6x + 15 = 117\ \Rightarrow\ x = 17 \]
\[ 6x + 15 = 117 \]
\[ 6x + 15 - 15 = 117 - 15 \ \Rightarrow\ 6x = 102 \]
\[ \frac{6x}{6} = \frac{102}{6} \ \Rightarrow\ x = 17 \]
\[ 6\cdot17 + 15 = 102 + 15 = 117 \checkmark \]Trying values of x in 6x + 15 = 117
| x | 6x + 15 | Equals 117? |
|---|---|---|
| 15 | 105 | no |
| 16 | 111 | no |
| 17 | 117 | yes |
| 18 | 123 | no |
| 19 | 129 | no |
Questions
What is x in 6x + 15 = 117?
The solution of 6x + 15 = 117 is x = 17.
How do you solve 6x + 15 = 117?
Subtract 15 from both sides to get 6x = 102, then divide both sides by 6 to get x = 17.
How do I check the answer?
Replace x by 17: 6(17) + 15 = 117, which is 117.