from typing import Tuple
from typing import List


def GetArrayValuesNegative(startX: int) -> Tuple[List[int],List[int]]:
    """
        Calculates the lines in the negative gradient
        Returns lists of X and Y coordinates
    """

    start = int(startX / 2)
    xVals = []
    yVals = []

    for i in range(start, startX + 1):
        xVals.append(i)
        yVals.append(startX - i)
    return xVals, yVals