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Verified answer
PersaMaan GaRisy = 2x + 1 ---> m1 = 2
sejajar ---> m1 = m2 = 2
persamaan garis dg m2 = 2 dan mlalui (x1,y1) = (1,-2) :
y - y1 = m2(x - x1)
y - (-2) = 2(x - 1)
y + 2 = 2x - 2
y = 2x - 4
atau
2x - y - 4 = 0
atau
y - 2x + 4 = 0