describe a pair of real-world variables that could be relate

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describe a pair of real-world variables that could be related by a graph of this shape
我画了一个linear function
关键是怎样描述？能举个例子吗

变量来自于函数,函数与图形相符.
如：图形是一个圆,半径为r,则满足x²+y²=r²的变量(x,y)即可.
题目应该是让找出图形的函数表达式.
再问：他已经给了函数表达式：f(X)=2x+3
再答：那就任取一个x，如x=0，得到对应的f(x)=3 (0，3)即可可能是要画出直线，然后在直线上标出一个点及其坐标

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