Answer: 4. -36 6. w=-18
Step-by-step explanation: For 4 you multiply both sides by 9 and you get a=-36 or you could do the inverse and go 9*-4 which also gives you -36. For 6 you multiply both side by 9/4 which gives you w=-8*9 over 4 then you simplify to get -72/4 and divide to get -18.