For this problem, my gut tells me I need to use pivot_longer but I don't know how to implement it here

> mpg2 b # A tibble: 32 x 6 manufacturer class cty_1999 cty_2008 cyl_1999 cyl_2008 1 audi compact 17.4 18.6 4. 86 O UT 2 audi midsize 15 16.5 3 chevrolet 2 seater 15.5 15.3 8 8 4 chevrolet midsize 18.5 19 5 5.33 5 chevrolet suV 12.7 12.7 8 8 6 dodge minivan 16.2 15.4 5.67 6 7 dodge pickup 11.7 12.2 7.43 7.67 8 dodge suv 11. 7 12 7.33 8 9 ford pickup 13 13 7.2 8 10 ford subcompact 16.5 15.4 7 7.2 # ... with 22 more rows . Why are these data not tidy? . How can you make the data tidy? (Specific function)