(1)3x+4y=15 2y-z=2 x+2z=9 (2) x+y+z=8 2x+3y-z=6 3x-y+z=8 (3)2x+y+z=16 3x+2y+4z=44 x+3y+5z=52

3x+4y=15 2y-z=2 x+2z=9y=(2+z)/2x=9-2z3(9-2z)+4+2z=15z=4y=3x=1x+y+z=8(1)2x+3y-z=6(2)3x-y+z=8 (3)(1)+(2) 3x+4y=14(1)-(3) -2x+2y=0x=yx=2y=2z=42x+y+z=16(1)3x+2y+4z=44(2) x+3y...