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Jadi nilai y nya adalah 4
misalkan y = a
y-a = -1(x-1)
y - a = -x +1
y + x = 1 + a
y-2a = -1(x-(-3))
y - 2a = -x -3
y + x = -3 + 2a
y + x = y+x
1 +a = -3 + 2a
a = 4
jadi a=4
jadi y =4