Respuesta :

iwantaclairoalbum

Answer:

230 were sold at the door

170 were sold in advance

Step-by-step explanation:

i'm not entirely sure  if this is the proper way to do it but it has the correct answer:

x=at door y=in advance

x+y=400

3x+2y=1030

y=-x+400

2y=-3x+1030

y=-3/2x+515

-x+400=-3/2x+515

x=230 y=170

hope this helps :) have a nice day !!

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