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ax - by = ax1 - by1
8x +2y = 8(1) +2(8)
8x + 2y = 8+16
8x + 2y = 24
8x + 2y -24 =0
2. m=-a/b = -2/1
ax - by = ax1 - by1
2x - y = 2(1) -1(-2)
2x -y = 2+2
2x + y = 4