/4.4/5.-17/6.a=2,b=1/164p/(2,3)/-1/-15/-6/166p/a(1,1)/0/(-3/2)/1/-2/32/19/168p/(1)y=20-0.05x(2)15.5L170p/(1)-0.006x+25(2)4(3)1000/2.y=-25x+150/
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