Answer:
noway 09
Step-by-step explanation:
f(9) = 72
f(9) means what is the value of f(x) when x = 9
9 > 6, thus f(x) = 8x
f(9) = 8 × 9 = 72
comparing both equations
-2x-1=3x+4
or, -1-4 =3x+2x
or, -5=5x
or, X= -1
Y= -2x-1
or, Y= -2(-1)-1
or, Y=1
hence, ( -1,1)