Answer:
6x-10
Step-by-step explanation:
Because if you take 9x+6 minus 3x-4 you get 6x-10 because when you subtract a negetive you add them. :) Hope this helps.
$29
146-59=87
87/3= 29
9y = -4x + 6
y = -4/9x + 2/3
Total Cost C = 10*150 + 20*50
= 2500 pence