看不懂英文啊 T T
state whether or not each equation defines a direct variation .for each direct variation ,state the constant of variation.
1,y=3x 2,p=4/q (这些只给一个数,看不懂……）
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state whether or not formula shows a direct variation
1,x1/y1=x2/y2 2,x1/x2=y1/y2
3,y1/x2=y2/x1 4,y2/x2=y1/x1
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x1=15 ,y1=9
x2=40,y2=?