Answer:
2/7
Step-by-step explanation:
there are 2 gray prices out of 7
x+y=-2
7x-4y=8
x=(8/3, infinity)
-3x+8<15-3x+8
-3x+8<-3x+23
8<23
15-3x+8<15
23-3x<15
-3x<-8
x>8/3
Therefore, x=(8/3, infinity)