1) x + y = -5 (Add both the equations(equation1 + equation2))
2) -3x - y = 7
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-2x = 2
x = -1
x + y = -5
-1 + y = -5 (put the value of x = -1)
y = -5 + 1
y = -4
So, x = -1
and y = -4
Alternate method:-
1) x + y = -5
x = -5 - y
2) -3x - y = 7
-3(-5 - y) - y = 7 (take the value of x = - 5 - y from equation(1) and put in 15 + 3y - y = 7 equation(2))
2y = 7 - 15
2y = -8
y = -4
1) x = - 5 - y (put the value of y = -4 in equation(1))
x = - 5 -(-4) (negative * negative = positive)
x = - 5 + 4
x = -1
Answer:- x = -1
y = -4
