Barbara sells iced tea for $1.49 per bottle and water for $1.25 per bottle. she wrote an equation to find the number of drinks she needs to sell to earn $100.

I remember doing this question. The question went like:
1.25x + 1.49 = 100
What error did Barbara make in writing the equation?
And the answer would be that Barbaras equation did not consider the number of ice tea drinks. Hence, She put the correct price in the equation but she didn't put the (x) number of iced tea drinks. In other words,This is because she has added 1.25 X the number of water bottles sold to 1.49, the cost of one iced tea. 
So, the correct equation would be:
1.25x +1.49y = 100
Would really appreciate if you would put me as Brainliest answer. 

Ibelieve 4mn because it’s like you’re combining them