exam Maths Puzzle Numerical Ability

the question is in three parts. Write a function that shows how much profit a company makes for a catering event on sandwiches that are made for .85 and sold for 2.00. Then show

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Please solve and graph for me please
2x + 3y =1
5x + 3y =16
x+2y=10

4x+5y=31

i need to kno what x and y equal..
I dont understand HOW to do this..