exam Maths Puzzle Numerical Ability

SOLVE EACH EQUATION: FROM A STUDY GUIDE FOR A SAMPLE FINAL:

LOG BASE 3 SQ RT X-2 = 2

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exam Other Question

Sam found a number of nickels, dimes, and quarters in his room. He found three more dimes than nickels but twice as many quarters as dimes. The total value of the coins was $5.05. how many coins of each type did Sam find? Hi!!!!!!

I have been having trouble with graphing, I sorta stubbled across this site. I am sure you all can help me. So basically it says to "Solve by graphing":
3x+y=5 -2x+3y=4
Please and Thank You=)