★利用加減消元法解下列聯立二元一方程。
1). x+y=8......(1)
x-y=2......(2)
2). m-n=2......(1)
m+n=-2......(2)
3). x+3y=5......(1)
x+2y=3......(2)
4). 5m+2n=8......(1)
3m-2n=8......(2)
5). 2x-7y=9......(1)
2x+3y=19......(2)
6). 4x-3y=2......(1)
-3y+x=5......(2)
7). x+y=4......(1)
2x+3y=10......(2)
8). 3x-5y=5......(1)
x+3y=3......(2)
9). 2x-y=3......(1)
5x-3y=4......(2)
10). x-3y=1.....(1)
5x+y=5......(2)
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