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nomor 10
Gradien ax + by + c = 0 adalah -a/b
m(i) = -4/2
m(i) = -2
m(ii) = (-1)/(-2)
m(ii) = 1/2
m(iii) = -2/4
m(iii) = -1/2
m(iv) = -(-2)/4
m(iv) = 2/4
m(iv) = 1/2
garis sejajar apabila punya gradien sama, maka pasangan garis sejajar adalah garis (ii) dan (iv)