Answer:
2(x+y+2)=49
Step-by-step explanation:
The balanced equation for the given reaction 
<h3>What is a double replacement reaction?</h3>
A double replacement is a chemical reaction that takes place in which two reactants swap cations or anions to produce two distinct products.
Whenever the cations representing one of the reactants interact with the anions from another reactant to produce an insoluble ionic compound, a precipitate occurs.
The balanced equation for the given reaction:

Learn more about double displacement reactions here:
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Answer:
7
Step-by-step explanation:
Count the numbers in between (0,0) and (0,7).
I think that the answer you are looking for is 0.3