Solve 4x + 13 = 65
The solution of 4x + 13 = 65 is x = 13.
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 13 from both sides:
- 3
Divide both sides by 4:
- 4
Check: put x = 13 back into the equation.
LaTeX source of the formulas on this page
\[ 4x + 13 = 65\ \Rightarrow\ x = 13 \]
\[ 4x + 13 = 65 \]
\[ 4x + 13 - 13 = 65 - 13 \ \Rightarrow\ 4x = 52 \]
\[ \frac{4x}{4} = \frac{52}{4} \ \Rightarrow\ x = 13 \]
\[ 4\cdot13 + 13 = 52 + 13 = 65 \checkmark \]Trying values of x in 4x + 13 = 65
| x | 4x + 13 | Equals 65? |
|---|---|---|
| 11 | 57 | no |
| 12 | 61 | no |
| 13 | 65 | yes |
| 14 | 69 | no |
| 15 | 73 | no |
Questions
What is x in 4x + 13 = 65?
The solution of 4x + 13 = 65 is x = 13.
How do you solve 4x + 13 = 65?
Subtract 13 from both sides to get 4x = 52, then divide both sides by 4 to get x = 13.
How do I check the answer?
Replace x by 13: 4(13) + 13 = 65, which is 65.