Substituting for z in equations 1 and 3 we have
2x - y + 5 = -4
-2x + 3y - 5 = 10
2x - y = -9
-2x + 3y = 15 Adding these 2 equations:-
2y = 6
y = 3
Plugging in y = 3 and z = 5 into the original equation:-
2x - 3 + 5 = -4
2x = -6
x = -3
so answer is x= -3,y = 3 and z = 5.
