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f(x) = ax+b
f(-1)= -1a+b= 9
f(2) = 2a+b= 6
-1a+b = 9
2a+b = 6
di bagi
3a = 15
a = 7
-1a+b= 9
2'7+b = 9
3 +b= 9
+b= 6
Semogamembantu.