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untuk x = -1 , m = 2(-2)- 2
m = - 6
pers garis dgn gradien m= -6 melalui (x1,y1)=(-1 ,4)
y = m ( x- x1) + y1
y = -6 (x +1) + 4
y = -6x - 2
atau
6x +y +2 = 0