Question: Solve this system of equations using elimination / adding method { - 1 x + 1 y = 1 - 4 x - 1 y

Solve this system of equations using elimination/adding method
{-1x+1y=1
-4x-1y=-21
x=
y=
Solve this system of equations using elimination/adding method {-1x+1y=1 -4x-1y=-21 x=

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