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maka m = 2
y-y1 = m(x-x1)
y-3 = 2(x-1)
y-3 = 2x-2
y = 2x-2+3
y = 2x +1
karena garisnya sejajar maka gradiennya sama,
jadi,
(y-3) = 2(x-1)
y-3 = 2x -1
2x-y = -1