Solve the system by the substitution method.
X+Y=-3
Y=-4x
2 answers:
x = 1, y = - 4
substitute y = - 4x into the other equation
x - 4x = - 3
- 3x = - 3 ( divide both sides by - 3 )
x = 1
substitute x = 1 into y = - 4x ⇒ y = - 4
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