khanacademy

Hi Alexandra! We don't have a video exactly about that... this is as close as we get: https://t.co/PwI81ehFsL (but we use numbers instead of unknown coefficients). We have some exercises with unknown coefficients, but the equations are a bit simpler: https://t.co/2wCepPo703

— Khan Academy (@khanacademy) July 30, 2018