1) (2.1) is the point of intersection of two lines.
X+Y=3; 3X+Y=7
x-Y-3=0;3X -Y =0
x+3y-3=0; X-Y-7=0
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kvhxjcysufjvjfiykgubkcjFgjxlxvjvvb. b;,!.090.09
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