Please help! I don’t know how to write the equations

Answer:
Step-by-step explanation:
Let sundaes be s and banana splits be b
s= $2 b=$3
Shop sold 8 more x than y
s= b+8
2s + 3b = 156
replace s with b+8
2(b+8) + 3b = 156
Here is the equation, now you can solve it further :-)