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m = ( -5 + 7 ) : ( 3 - 4 )
m = 2 : -1
m = -2
Persamaan garis :
y = -2x - ( -2 × 4 + 7 )
y = -2x + 1
Titik potong sumbu y, x = -1 :
y = -2x + 1
y = -2(-1) + 1
y = 2 + 1
y = 3