Step-by-step explanation:
2x+3y= 6 Â Â >>> Â Â Â Â Â 2x + Â 3y = 6
x+y=4 Â Â Â times both sides by 2 Â >>> Â Â 2x + 2y = 8
       subtract these two equations ==>>  (2x - 2x) + (3y - 2y) = 6 - 8
                                            0x   +    y    =  -2
    y = -2   so if  x + y = 4       plug in -2 where y was
               x + (-2) = 4        add 2 to both sides
                  x  =  6
(6,-2)
(-2,6)
(-3, 4)
(0, 2)