Linear equations : 4x+6=8 , 4x-5y = 9 , 5x2 + 6xy - 4y2 = 16 , xy + yz+ zx = 11 , 3x + 2y - 6 = 0 , 3 = 2x + y , 7p + 6q + 13s = 11 please give answers 1,2,3,4,5,6,7, please please give answers
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