Question

escalone , resolva e classifique os sistemas x+y+z=4 5x+2y+z=3 6x+3y+2z=7

Answer 1

X+y+z=4. X=4-y-z

5x-2y+z=3. 5(4-y-z)-2y+z=3

6x+3y+2z=7. 20-5y-5z-2y-z=3

20-3-7y=6z

17-7y=6z

Z= 17-7y/6

4-y-(17-7/6)+y+17-7y/6=4

4-y-17+7y/6+y+17-7y/6=4