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2(2) - 3(2) = 10
4 - 6 = -2
2. A karena ax + 5y = 10 dengan (2.4)
-5(2) + 5(4) = 10
-10 + 20 = 10
3. C karena 3x - y = 0 dengan (0,0)
3(0) - 0 = 0
0 - 0 = 0
4. B karena 3y - 2x - 9 =0 dengan (0,3)
3(3) - 2(0) - 9 = 0
9 - 0 - 9 = 0
9 - 9 = 0