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m = koefisien x = 1/2
karena sejajar maka gradiennya sama (1/2)
persamaan garis :
y-y1 = m(x-x1)
y-4 = 1/2 (x-(-4))
y-4 = 1/2x + 2 (kalikan dgn 2 agar tidak ada yang pecahan)
2y-8 = x +4
2y = x+4+8
2y = x + 12