Answer:
y = - 2
Step-by-step explanation:
Given the 2 equations
3x + y = - 2 → (1)
x - 2y = 4 → (2)
Rearrange (2) expressing x on terms of y by adding 2y to both sides
x = 2y + 4
Substitute x = 2y + 4 into (1)
3(2y + 4) + y = - 2 ← distribute and simplify left side
6y + 12 + y = - 2
7y + 12 = - 2 ( subtract 12 from both sides )
7y = - 14 ( divide both sides by 7 )
y = - 2
