Y=-4x+15
8x-2y=-30
using a substitution method or elimination method.

Here with substitution
8x - 2(-4x + 15) = -30
8x + 8x - 30 = -30
16x = 0, x = 0
8(0) - 2y = -30
-2y = -30, y = 15
The x = 0, y = 15

Ais less than or equal to -5