In the XY-plane, region R consists of all the points(x,y) such that 2x+3y=6. Is the point (r,s) in region R?
(1) 3r+2s=6
(2) r=3 and s=2
答案选E但是我认为2是不会在REGION R 上的,所以也可以来判断出(R,S)不在R上! 请高人指教!
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