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Sejajar: maka m1 = m2
gradien garis pertama:
2y= -x-3
y = (-x/2)-3
maka gradiennya = -1/2
persamaan garis (2,1)
y - y1 = m(x-x1)
y-1 = -1/2x+2
y = -1/2x +3
2y = -x +6
maka persamaan garisnya adalah:
2y + x - 6 = 0