Solve the system by the substitution method.
x + y = -2
y = – 3x
Solution:-
x + y = -2……(1)
y = – 3x …..(2)
Put the value of y = -3x in the equation (1)
x + (-3x) = -2
-2x = -2
x = 1
Put the value of x = 1 in the equation (1)
-1 + y = -2
-3 = y
The solution set is (1,-3).