exam Maths Puzzle Numerical Ability

I can not figure out how to do algebric word problems. Not one.

If 2 is added to five times a number, the result is equal to 5 more than four times the number. find the number.

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exam Other Question

I need help with the following question. The problem needs to be solved using subsitution. The answer that I got does not agree with the answer in the book.

y=x^2
x^2+y^2=1 Sam emptied his collection of nickels and dimes on his bed. If his 46 coins were worth $3.10, how many coins of each type did he have?