1400,2100,2800 y=700x 함수이다 OXOO 1,1,6,2,2,12,3,3,18/5 1,3 8,-4 -4,9,2,-1 5 1 -12 5 3 2/A(-2분의5),B(-1),C(3) y축,원점,x좌표 생략 A(2,4),B(-3,1),C
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