Structure strGerade
        Private m_X1 As Single
        Private m_X2 As Single
        Private m_Y1 As Single
        Private m_Y2 As Single
        Private m_m As Single
        Private m_b As Single
        Sub New(ByVal X1 As Single, ByVal X2 As Single, ByVal Y1 As Single, _
          ByVal Y2 As Single)
            m_X1 = X1
            m_X2 = X2
            m_Y1 = Y1
            m_Y2 = Y2
            m_m = (Y2 - Y1) / (X2 - X1)
            m_b = Y2 - m_m * X2
            If Y2 = Y1 Then m_m = 0
            If X2 = X1 Then m_b = Y2 - Y1 : m_m = 0
        End Sub
        ReadOnly Property X1() As Single
            Get
                Return m_X1
            End Get
        End Property
        ReadOnly Property X2() As Single
            Get
                Return m_X2
            End Get
        End Property
        ReadOnly Property Y1() As Single
            Get
                Return m_Y1
            End Get
        End Property
        ReadOnly Property Y2() As Single
            Get
                Return m_Y2
            End Get
        End Property
        ReadOnly Property m() As Single
            Get
                Return m_m
            End Get
        End Property
        ReadOnly Property b() As Single
            Get
                Return m_b
            End Get
        End Property
    End Structure
    Function GetSchnittpunkt(ByVal Gerade1 As strGerade, ByVal Gerade2 As _
      strGerade) As PointF
        Dim KreuzX As Single = (Gerade2.b - Gerade1.b) / (Gerade1.m - Gerade2.m)
        Dim KreuzY As Single = Gerade1.m * KreuzX + Gerade1.b
        If KreuzX.ToString = "n. def." And KreuzY.ToString = "n. def." Then
            Throw New Exception("Die Linien Verlaufen Parallel und treffen" & _
              "sich" & _
              "deshalb Nie.")
        End If
        Return New PointF(KreuzX, KreuzY)
    End Function

        Try
            Dim g1 As strGerade = New strGerade(0, 100, 0, 100)'Hier musst du 
            ' entsprechend selbst deine Koordinaten eintragen...(hier wird New 
            ' das erste mal aufgerufen)
            Dim g2 As strGerade = New strGerade(0, 200, 0, 200)'genauso wie 
            ' hier...
            Dim pnt As PointF = GetSchnittpunkt(g1, g2)
            MsgBox(pnt.ToString)'Gibt den Schnittpunkt aus
        Catch ex As Exception
            MsgBox(ex.Message)
        End Try
'Ergebnis die Linien verlaufen Parallel