Use Trend Worksheetfunction On Vba Array

I am trying to use the TREND worksheet function on a vba array. I keep getting Runtime error 1004: Unable to get the TREND property of the WorksheetFunction Class. I can bypass the error (like it were a search with no result), but I get no result of any kind from the function. My search of other threads yields nothing concrete, but causes a guess that it may have to be used on a worksheet range not a vba array. But that's not actually stated in any of the threads, and I find no documentation to that effect. Is this the issue or is it something else altogether?

Sub test()
Dim knowny As Variant
Dim knownx As Variant
Dim newx As Integer
Dim myval As Integer
knowny = Array(2, 4, 6, 8, 10)
knownx = Array(1, 2, 3, 4, 5)
newx = 6
'On Error Resume Next
myval = Application.WorksheetFunction.Trend(knowny, knownx, newx)
' 'next error, err as normal.
' On Error GoTo 0
' Err.Clear
Debug.Print myval
End Sub