Sub Tri()
Sheet = Array("F1", "F2") ' List Sheets.
For m = LBound(Sheet) To UBound(Sheet) ' Loop on Array Sheets.
For n = Sheets(Sheet(m)).Range("A" & Rows.Count).End(xlUp).Row To 5 Step -1 ' Loop on lines (Last to First).
x = Sheets(Sheet(m)).Range("B" & n) ' X Val.
y = Sheets(Sheet(m)).Range("C" & n) ' Y Val.
Set B = Sheets("F3").Columns(1).Find(x, LookIn:=xlValues, lookat:=xlWhole) ' Set the B value.
Set C = Sheets("F3").Columns(1).Find(y, LookIn:=xlValues, lookat:=xlWhole) ' Set the C value.
If (B Is Nothing) Or (C Is Nothing) Then ' If one "Nothing"
Sheets(Sheet(m)).Rows(n).Delete ' delete the line.
End If ' End nothing.
Next ' Next loop "Lines"
Next ' Next loop "Sheets"
End Sub