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Algebra/Help on Solving Simultaneous Equations?

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Question
How do I go about solving our these Simultaneous Equations questions?

I'm so confused on how to do them or work them, it hurts just to do these.

4x+6y=62
2x+5y=49

5x+2y=43
8x - y=52

3x+10y=9500
8x+3y=6400

I want to know how I would work these out and what are the basics in handling these type of questions?

Answer
Just use algebra to eliminate one of the variables.  
For the first set, divide eq. 1 by 2 to get 2x+3y = 31
then subtract that from the second eq. to get 2y = 18 so y = 9 and then x=2
For the second set, multiply the second eq. by 2 to get 16x-2y = 104
add the two eqns. to get 21x = 147 so x = 7 and y = 4
For the third set, multiply the 1st eq. by 8 to get 24x+80y = 76000
multiply the 2nd eq. by 3 to get 24x+9y = 192oo
subtract the 2nd from the 1st to get 71y = 56800 so y = 800 and then x = 500

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