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a+2b=-1
f(2)=a(2)+2b=-10
2a+2b=-10
a+2b=-1
2a+2b=-10
------------------ -
-a=9
a=-9
(-9)+2b=-1
2b=-1+9
2b=8
b=4
f(x)=ax+2b
f(x)=-9x+2(4)
f(x)=-9x+8
f(6)=-9(6)+8 = -54+8= -46