490x + 700y < = 4000 (thats less then or equal)
Answer: B) -48
Step-by-step explanation:
If the system of two linear equations
has infinitely many solutions , then

For the given system of linear equations : 
We , will have

The value of 
Hence, the value of rs is -48.
Thus , the correct option is B) -48.
Hope this helps! This is the long division way.