Solve 11x + 15 = 235
The solution of 11x + 15 = 235 is x = 20.
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 = 20 back into the equation.
LaTeX source of the formulas on this page
\[ 11x + 15 = 235\ \Rightarrow\ x = 20 \]
\[ 11x + 15 = 235 \]
\[ 11x + 15 - 15 = 235 - 15 \ \Rightarrow\ 11x = 220 \]
\[ \frac{11x}{11} = \frac{220}{11} \ \Rightarrow\ x = 20 \]
\[ 11\cdot20 + 15 = 220 + 15 = 235 \checkmark \]Trying values of x in 11x + 15 = 235
| x | 11x + 15 | Equals 235? |
|---|---|---|
| 18 | 213 | no |
| 19 | 224 | no |
| 20 | 235 | yes |
| 21 | 246 | no |
| 22 | 257 | no |
Questions
What is x in 11x + 15 = 235?
The solution of 11x + 15 = 235 is x = 20.
How do you solve 11x + 15 = 235?
Subtract 15 from both sides to get 11x = 220, then divide both sides by 11 to get x = 20.
How do I check the answer?
Replace x by 20: 11(20) + 15 = 235, which is 235.