Solve 5x + 13 = 98
The solution of 5x + 13 = 98 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 13 from both sides:
- 3
Divide both sides by 5:
- 4
Check: put x = 17 back into the equation.
LaTeX source of the formulas on this page
\[ 5x + 13 = 98\ \Rightarrow\ x = 17 \]
\[ 5x + 13 = 98 \]
\[ 5x + 13 - 13 = 98 - 13 \ \Rightarrow\ 5x = 85 \]
\[ \frac{5x}{5} = \frac{85}{5} \ \Rightarrow\ x = 17 \]
\[ 5\cdot17 + 13 = 85 + 13 = 98 \checkmark \]Trying values of x in 5x + 13 = 98
| x | 5x + 13 | Equals 98? |
|---|---|---|
| 15 | 88 | no |
| 16 | 93 | no |
| 17 | 98 | yes |
| 18 | 103 | no |
| 19 | 108 | no |
Questions
What is x in 5x + 13 = 98?
The solution of 5x + 13 = 98 is x = 17.
How do you solve 5x + 13 = 98?
Subtract 13 from both sides to get 5x = 85, then divide both sides by 5 to get x = 17.
How do I check the answer?
Replace x by 17: 5(17) + 13 = 98, which is 98.