Solve 5x + 15 = 50
The solution of 5x + 15 = 50 is x = 7.
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 5:
- 4
Check: put x = 7 back into the equation.
LaTeX source of the formulas on this page
\[ 5x + 15 = 50\ \Rightarrow\ x = 7 \]
\[ 5x + 15 = 50 \]
\[ 5x + 15 - 15 = 50 - 15 \ \Rightarrow\ 5x = 35 \]
\[ \frac{5x}{5} = \frac{35}{5} \ \Rightarrow\ x = 7 \]
\[ 5\cdot7 + 15 = 35 + 15 = 50 \checkmark \]Trying values of x in 5x + 15 = 50
| x | 5x + 15 | Equals 50? |
|---|---|---|
| 5 | 40 | no |
| 6 | 45 | no |
| 7 | 50 | yes |
| 8 | 55 | no |
| 9 | 60 | no |
Questions
What is x in 5x + 15 = 50?
The solution of 5x + 15 = 50 is x = 7.
How do you solve 5x + 15 = 50?
Subtract 15 from both sides to get 5x = 35, then divide both sides by 5 to get x = 7.
How do I check the answer?
Replace x by 7: 5(7) + 15 = 50, which is 50.