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bx-ay= (bx1 - ay1)
6x - 7y = {(-6) x 4 - 7 x (-2)}
6x - 7y = {-24 + 14}
6x - 7y = -10
jadi persmaan garisnya yaitu 6x - 7y = -10
2) bx-ay= (bx1 - ay1)
5x - 3y = 5 x 2 - 3 x 3
5x - 3y = 10 - 9
5x - 3y = 1
jadi persamaan garisnya yaitu 5x - 3y =1