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y-y1 ÷ y2-y1 = x-x1 ÷ x2-x1
y+1 ÷ (-6)+1 = x+4 ÷ 3+4
y+1 ÷ (-5) = x+4 ÷ 7
y+1 × (7) = x+4 × (-5)
7y + 7 = -5x -20
7y +5x = -20 -7
7y + 5x = -27
m = -5/7
yang gradiennya -5/7,,, yang b, c