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y=ax+b
b=5
a1*a2=-1
-3a=-1
a=1/3
Odp. y=1/3 x+5
2.
f(-1)=-a-6=4
-a=4+6
a=-10 , x≠0
-10/x-6=0 /*x
-10-6x=0
-6x=10
x=-10/6
x=-5/3
3.
sin150=sin(180-30)=sin30=1/2
tg125=tg(180-125)= -tg55=-1,4281
cos98=cos(90+8)= -sin8= -0,1392