To solve for y, you need to isolate/get the variable "y" by itself in the inequality:
x + 8y < 16 Subtract x on both sides
x - x + 8y < 16 - x
8y < 16 - x Divide 8 on both sides to get "y" by itself
[tex]\frac{8y}{8} <\frac{16-x}{8}[/tex]
[tex]y<2-\frac{x}{8}[/tex]
