For this case we have:
x: Number of candies that Sydney has
The equation to find the amount of Sydney sweets is given by:

We want to clear x:



So, Sydney has 10 candies
Answer:
Sydney has 10 candies
They have to correlate to each other
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Y=x+3
you need to add the x to the opposite side to get y by itself
8 days because 4/5 = 8/10 and he is using 1/10 a day.