Help me solve the following equation 8 - 4y - 9y < 86

Combine like terms:
-13y + 8 < 86
subtract 8
-13y < 78
divide by -13
y > 6
Note: You have to flip the inequality sign, because you divided by a negative number.

8-4y-9y < 86 (original equation)
8-13y < 86 (combine like terms)
-13y < 78 (subtract 8)
y > -6 (divide by -13 and flip)

Solution: y > -6

8 - 4y - 9y < 86
8 - 13y < 86
-13y < 78
y > -6

Cheers!

8 - 4y - 9y < 86
-13y < 78
-y < 6
y > -6

y>-6

8 - 4y - 9y < 86
y > -6