The circumference of an isosceles triangle is 20 1. Write the analytic formula of the function of the base length y with respect to the waist length x (x is the independent variable) 2. Write the value range of the independent variable 3. Draw function image in rectangular coordinate system

1,2x + y = 20, so the analytic expression of the function of the base length y with respect to the waist length x is y = - 2x + 20,

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