Question

Which ordered pair is the solution to the system of equations?

x+3y=12
-4x+3y=-3
A.
(0, 4)

B.
(6, 2)

C.
(3, 3)

D.
(0, −1)

Answer 1

$x+3y=12\\ -4x+3y=-3\\\\ x+3y=12\\ 4x-3y=3\\ ------\\ 5x=15\\ x=3\\\\ 3+3y=12\\ 3y=9\\ y=3\\\\ (3,3)$

Answer 2

-1*/x+3y=12
-4x+3y=-3 

-x-3y= -12
-4x+3y= -3
+-------------------
-5x= -15   
x=3

x+3y=12

3+3y=12

3y=9  y=3

(x,y)=(3,3)