Question

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Answer 1

graphing is fun and ez

Answer 2

it depends....I use substitution in this case :
x + y = 4
x + 2y = 14
this way, you can solve for x or y in the 1st equation and then sub that into the 2nd equation.

2x + 3y = 6
4x + 2y = 12
I would use elimination on this because you would just have to multiply 1st equation by -2 to eliminate the x's, and then solve for y.

You can use graphing for either one of these equations..I just think it is personal preference which method you chose to use.