gets
while str = gets do
    x1, y1, x2, y2, x3, y3, x4, y4 = str.chomp.split(" ").map(&:to_f)
    if (x2 - x1)/(y2 - y1) == (x4 - x3)/(y4 - y3)
        puts "YES"
        else
        puts "NO"
    end
end