Ineeed asap

ashur solves the following system of linear equations.

-3a+7b=-16
-9a+5b=16

which statement about the solution to this system can he say is true?
the values of a and b are both equal to –4.
the values of a and b are both equal to 4.
the value of a is equal to 4, and b is equal to –4.
the value of a is equal to –4, and b is equal to 4