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m = ( -3 - 2 ) : ( -1 - 1 )
m = -5 : -2
m = 5/2
Persamaan garis :
y = 5/2x - ( 5/2 × 1 - 2 )
y = 5/2x - 1/2
2y = 5x - 1
5x - 2y = 1