Solve 10x + 5 = 165
The solution of 10x + 5 = 165 is x = 16.
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 5 from both sides:
- 3
Divide both sides by 10:
- 4
Check: put x = 16 back into the equation.
LaTeX source of the formulas on this page
\[ 10x + 5 = 165\ \Rightarrow\ x = 16 \]
\[ 10x + 5 = 165 \]
\[ 10x + 5 - 5 = 165 - 5 \ \Rightarrow\ 10x = 160 \]
\[ \frac{10x}{10} = \frac{160}{10} \ \Rightarrow\ x = 16 \]
\[ 10\cdot16 + 5 = 160 + 5 = 165 \checkmark \]Trying values of x in 10x + 5 = 165
| x | 10x + 5 | Equals 165? |
|---|---|---|
| 14 | 145 | no |
| 15 | 155 | no |
| 16 | 165 | yes |
| 17 | 175 | no |
| 18 | 185 | no |
Questions
What is x in 10x + 5 = 165?
The solution of 10x + 5 = 165 is x = 16.
How do you solve 10x + 5 = 165?
Subtract 5 from both sides to get 10x = 160, then divide both sides by 10 to get x = 16.
How do I check the answer?
Replace x by 16: 10(16) + 5 = 165, which is 165.