ramonirving708 ramonirving708 29-09-2020 Mathematics contestada Which of the following options is the standard form of the linear equation 7x - 21 + 2y = 0? 7x + 2y - 21 = 0 21 + 2y + 7x = 0 2y + 7x - 21 = 0 7x - 21 + 2y = 0