since the first equation x = y + 6 is all ready set to be substituted, put y + 6 in for x in the second equation
y = -2 - (y + 6) distribute the negative so y = -2 - y - 6
combine like terms so y = -8 - y
add y to both sides 2y = -8
divide both sides by 2 and y = -4
Replace y with -4 in the first equation and x = -4 + 6 or x=2
point is then (2, -4)