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(1,-3) --> -3 = a + b
(4,9) --> 9 = 4a + b _
-12 = -3b
b = 4
a + b = -3
a + 4 = -3
a = -3 - 4
a = -7
3a + 2b = 3(-7) + 2(4)
= -21 + 8
= -13
semoga membantu ya :)