Question 909632
a)
x=$15 tickets
y=$17 tickets
z=$19 tickets
b)
x+y+z=25000
15x+17y+25z=434500
y=2z 

c)
1,1,1,25000
15,17,25,434500
0,1,-2,0
d)
(12,250;8,500;4,250)
1,0,0,12250 x 
0,1,0,8500 y
0,0,1,4250 z
e)
1,1,1,25000
8,12,20,256000
0,1,-2,0

1,0,0,16600 x $8
0,1,0,5600 y $12
0,0,1,2800 z $20