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m = -2/5
tegak lurus
m = 5/2
melalui (-6,-8)
y = 5/2(x-(-6))-8
y = 5/2(x+6)-16/2
2y = 5x+30-16
2y-5x = 14
5x-2y = -14
5x-2y+14 = 0