It is not but making a some how clear relationship among variables the dependent and independent variables. talking in terms of maths the equation can be used meaningfully for something may be to determine /predict values from data. if y = m * x + b the values for m , b can be anything but has to appropriate to predict y so the loss which is difference from existing to prediction is close to zero ~0 to start with we can say the one variable as -x in some scenario m , b are called variables the equation stated about is a line equation we have any equation y = 2*x y = x*x y = 2x +2x*x so why the need of all these equations , it is all about playing data now a days in machine learning problems we create a data sets , lets consider as x y to be a value of x the datas . y = datas when we express the data as a function and plot in the graph we get the curves take some random data x and plot x and y x =1 , 2, ...
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