.
2x + 5y = 4, (1)
4x + 10y = 1. (2)
Multiply the first equation by 2 (both sides). You will get an equivalent system
4x + 10y = 8, (1')
4x + 10y = 1. (2')
These equations have identical left sides, but different right sides.
It implies, that the system (1'),(2') has no solutions.
Answer. There are NO SOLUTIONS.
See the lesson
- Geometric interpretation of the linear system of two equations in two unknowns
in this site.
Also, you have this free of charge online textbook in ALGEBRA-I in this site
- ALGEBRA-I - YOUR ONLINE TEXTBOOK.
The referred lesson is the part of this online textbook under the topic "Systems of two linear equations in two unknowns".