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

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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

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
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

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.