I assume you mean y = 4x
If so, then it is 4.
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Without an equality sign the given terms can't be considered to be a straight line equation.
If you mean: y = 4x+5 then the perpendicular slope is -1/4
4x+y = 14 will be parallel to the above equation because the slope or gradient remains the same but the y intercept changes.
-4.6
The straight line equation is: y = -4x+1