The graph of a linear function is shown. A coordinate plane with a straight line drawn passing through (negative 5, negative 3) and (5, negative 3). Which word describes the slope of the line? positive negative zero undefinedThe graph of a linear function is shown. A coordinate plane with a straight line drawn passing through (negative 5, negative 3) and (5, negative 3). Which word describes the slope of the line? positive negative zero undefinedThe graph of a linear function is shown. A coordinate plane with a straight line drawn passing through (negative 5, negative 3) and (5, negative 3). Which word describes the slope of the line? positive negative zero undefined