Question 839246
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Hi,
find the values of graph x=4  (Graph: Vertical Blue Line)
x will be '4',  y-values can be any values along the line. 
{{{drawing(300,300,   -6, 6, -6, 6, grid(1), blue(line(4,6,4,-6)) ,
graph( 300, 300, -6, 6, -6, 6))}}}