Solve 11x + 15 = 125
The solution of 11x + 15 = 125 is x = 10.
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 11:
- 4
Check: put x = 10 back into the equation.
LaTeX source of the formulas on this page
\[ 11x + 15 = 125\ \Rightarrow\ x = 10 \]
\[ 11x + 15 = 125 \]
\[ 11x + 15 - 15 = 125 - 15 \ \Rightarrow\ 11x = 110 \]
\[ \frac{11x}{11} = \frac{110}{11} \ \Rightarrow\ x = 10 \]
\[ 11\cdot10 + 15 = 110 + 15 = 125 \checkmark \]Trying values of x in 11x + 15 = 125
| x | 11x + 15 | Equals 125? |
|---|---|---|
| 8 | 103 | no |
| 9 | 114 | no |
| 10 | 125 | yes |
| 11 | 136 | no |
| 12 | 147 | no |
Questions
What is x in 11x + 15 = 125?
The solution of 11x + 15 = 125 is x = 10.
How do you solve 11x + 15 = 125?
Subtract 15 from both sides to get 11x = 110, then divide both sides by 11 to get x = 10.
How do I check the answer?
Replace x by 10: 11(10) + 15 = 125, which is 125.