For two consecutive numbers, five times the number that is less is 3 more than 4 times the greater number, What are the numbers This is due on 7/1/2021 at 8AM PST. Someone please help?

Which sum or difference identity would you use to verify that cos (180° - q) = -cos q? a.) sin (a -b) = sin a cos b – cos a sin b b.) cos (a -b) = cos a cos b – sin a sin b c.) cos (a -b) = cos a cosb + sin a sin b d.) sin (a + b) = sin a cos b + cos a sin b