I can change the value the -7 manually and press Enter to get a different vector plot. However, I cannot seem to get the function Manipulate[] to work - see additional examples below.
In[]:=
VectorPlot,,-7,.{x,y},{x,-5,5},{y,-5,5},Epilog->{Red,Arrow[{{0,0},1*{5,4}}],Blue,Arrow[{{0,0},0.8*{5,2}}]},Axes->True,AxesLabel->{"x","y"}
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Out[]=
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ManipulateVectorPlot,,-pred,.{x,y},{x,-5,5},{y,-5,5},Epilog->{Red,Arrow[{{0,0},1*{5,4}}],Blue,Arrow[{{0,0},0.8*{5,2}}]},Axes->True,AxesLabel->{"x","y"},{pred,1,7}
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Out[]=
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DynamicModule{x,y},ManipulateVectorPlot,,-pred,.{x,y},{x,-5,5},{y,-5,5},Epilog->{Red,Arrow[{{0,0},1*{5,4}}],Blue,Arrow[{{0,0},0.8*{5,2}}]},Axes->True,AxesLabel->{"x","y"},{pred,1,7}
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Out[]=
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ManipulateVectorPlotEvaluate,,-pred,.{x,y},{x,-5,5},{y,-5,5},Epilog->{Red,Arrow[{{0,0},1*{5,4}}],Blue,Arrow[{{0,0},0.8*{5,2}}]},Axes->True,AxesLabel->{"x","y"},{pred,1,7}
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Out[]=
