Answer:
Option- one is correct.
The given system of equations have one solution that is (7,-21)
Explanation:
Given system of equations are


Now to the solution:
To solve the given system of equations using substitution method.
That is substitute equation(1) in equation (2) we get
(here y=-3x)

(adding the like terms)

Therefore x=7
Now substitute x=7 in equation (1) we get



Therefore the solution is (7,-21)
Therefore Option- one is correct.
The given system of equations have one solution that is (7,-21)