1.
2x+3y = -19
x+y = 8
2x+3y = -19
x = 8-y
2(8-y)+3y = -19
x = 8-y
16 - 2y + 3y = -19
x = 8-y
y = -35
x = 8 -(-35)
y = -35
x = 43
2.
5x-y=-5
x-3y=16
5x-y=-5
x = 16 + 3y
5(16 + 3y)-y=-5
x = 16 + 3y
80 + 15y - y = -5
x = 16 + 3y
14y = -85
x = 16 + 3y
y = -85/14
x = 16 + 3(-85/14)
y = -6 i 1/14
x = 16 - 255/14
y = -6 i 1/14
x = 16 - 18 i i 3/14
y = -6 i 1/14
x = -2 i 3/14