1) (400 - 169)/ (961 - 576)=231/385=0.6
2) (289-484)/(2401 - 100)= -195/2301 =~ -0.08
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1) (400 - 169)/ (961 - 576)=231/385=0.6
2) (289-484)/(2401 - 100)= -195/2301 =~ -0.08