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y-y1 = m(x-x1)
y-3 = 2(x-2)
y-3 = 2x-4
-2x-y-3+4 =0
-2x-y+1 = 0
a=4 b=(-2)
ax + by = ax1 + by1
4x + (-2y) = 4.2 + (-2).3
4x - 2y = 8 - 6
4x - 2y = 2 (dibagi 2)
2x - y = 1