PLEASE HELP!!!!!! ILL GIVE BRAINLIEST *EXTRA 40 POINTS** !! DONT SKIP :((

Answer:
YES
Step-by-step explanation:
(-9, - 1) is a solution to the given system of linear equations.
x = - 9
x + 3y = - 9 + 3(-1) = - 9 - 3 = - 12