Error for "Variable not defined" I am sure this has a simple answer but I cannot find it. Please Help

 

Can anyone help? I think I am being particularly thick today.....

On the first line of code, I am taking an average of the values of three lines for an indicator in "Line 4" and assigning it to a double variable of "x"

In the second line of code, I want to take the value x and divide it by an external variable "Aver_Bars"

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Line_4[i]=((Line_1[i]+Line_2[i]+Line_3[i])/3)=x;

Line_5[i]= x/Aver_Bars;

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When I go to compile I am told that "Line_5 Variable is not defined"

So, my question is why? What did I do wrong??

 

Did you . . .

double Line_5[100];

. . . define the array variable first ?

Reason: