[질문] 개념플러스유형파워8-가에서 개념편 답이요P153~P155

(4)2.5, (5)6, (6)5, (7)-6, (8)4, (9)-3, (10)1, (11)3, (12)[yl1<=y<=5], (13)3, (14)1, (15) 1.y=1/3x-2/3, 2.y=-2x-2