Answer
u=16
Steps Explained:
Solve for u
15u + 640 = 55u
Group variables
Group our variables 15u and 55u
subtract 55u from both sides
15u + 640 - 55u = 55u - 55u
Cancel 55u on the right side:
-40u + 640 = 0
Divide each side by 15
| 15u | |
| 15 |
| = |
| 640 |
| 15 |
Group constants
Group our constants 640 and 0.
subtract 640 from both sides
-40u + 640 - 640 = 0 - 640
Cancel 640 on the left side:
-40u = -640
Divide each side of the equation by -40
| -40u | |
| -40 |
| = |
| -640 |
| -40 |
u = 16
Final Answer
u=16Related Calculators: Literal Equations | Simultaneous Equations | 4 unknowns using Cramers Rule