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R(-2)= a.(-2)+b = -2a+b= -4
R(-6)= a.(-6)+b = -6a+b= 12
dieliminasi
4a= -16
a= -4
substitusi ke salah satu persamaan
-2a+b= -4
-2(-4)+b= -4
b= -4-8= -12