Delete missing data from a set of 3 columns in Excel - vba

Question

I have a dataset that includes 9 columns. I want to check each row to see if the last 3 columns are empty. If all 3 are empty, I want to delete the row. I'm currently trying to do this in VBA, but I'm a programming newb and find myself completely overwhelmed.
The pseudocode that I've written is as follows:
For Row i
If(Col 1 & Col 2 & Col 3) = blank
Then delete Row i
Move on to next Row

Answer 1

I'd go like follows
Dim iArea As Long
With Range("E:G") '<--| change "E:G" to your actual last three columns indexes
If WorksheetFunction.CountBlank(.Cells) < 3 Then Exit Sub
With .SpecialCells(xlCellTypeBlanks)
For iArea = .Areas.Count To 1 Step -1
If .Areas(iArea).Count Mod 3 = 0 Then .Areas(iArea).EntireRow.Delete
Next
End With
End With

Answer 2

Assuming you have at least one row that is always filled out, you can use the following:
Dim LR as Long
Dim i as Integer
LR = Cells(Sheets("REF").Rows.Count,1).End(xlUp).Row
For i = 1 to 9
If Range(Cells(LR-3,i),(Cells(LR,i)).Value="" Then
Columns(i).Delete
Else:
End If
Next i
This works by defining the last row as LR, and defining a variable as i. You will check column "i" to determine if the last 3 rows of the column are "", aka it's blank; one might try to use ISBLANK(), but that cannot work for an array. If this is true, then you will delete the column, i. The code will then move to the next i. The FOR LOOP using i starts at 1 and goes to 9, which corresponds to starting at column 1 (A) and ending at column 9 (I).
Edit:
I appear to have misread which was supposed to be empty and which is supposed to be deleted, in terms of columns/rows... this code would be re-written as:
Dim LR as Long
Dim i as Integer
LR = Cells(Sheets("REF").Rows.Count,1).End(xlUp).Row
For i = LR to 2 Step -1 'Assumes you have headers in Row1
If AND(ISBLANK(Cells(i,7)),ISBLANK(Cells(i,8)),ISBLANK(Cells(i,9)) Then
Rows(i).Delete
End If
Next i
Significant changes are checking is each of the 3 last columns in the row are empty, ISBLANK(), changing that a row gets deleted if the condition is met, and changing what to loop through.

Answer 3

Here's another answer, assuming your last three column starts on "G","H","I".
Sub DeleteRowWithLastThreeColumnsBlank()
Dim N As Long, i As Long
N = Cells(Rows.Count, "A").End(xlUp).Row
For i = 1 To N
If Cells(i, "G").Value = "" And Cells(i, "H").Value = "" And Cells(i, "I").Value = "" Then
Rows(i).EntireRow.Delete
N = Cells(Rows.Count, "A").End(xlUp).Row
End If
Next i
End Sub