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y-4/-6-4 = x-(-3)/-8-(-3)
y-4/-10=x+3/-5
-5y+20=-10x-30
dibagi -5
hasilnya
y-4=2x+6
y=2x+10
rumus umum = y=mx+c
gradiennya 2
-6-4/-8-(-3)
-10/-5 = 2