y = -4
y = -2x-20
Substituting the value of y from the first equation into the second equation, we get:
-4 = -2x - 20
-4 + 20 = -2x - 20 + 20 adding 20 at both sides
16 = -2x
16/(-2) = -2x/(-2)
-8 = x
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