To solve this you will need to take 90-15=75 then take 75/3=25 so a biscuit costs 25p and a cake costs 40p becuase 25*2=50+40=90 enjoy!=)
Let y=kx
9=2k
k=4.5
when x=3
y=kx becomes
y=4.5 x 3
=13.5
Answer:
7+x
Step-by-step explanation:
the prefix bi means two there for two variables just like in the word bicycle which means two wheels