Algebra 2
posted by Allen on .
Before I go on and give you the problenms let me explain. i am not some lazy kid trin to get people to do my homework over the internet. I am freshman that just recently skippeda garde in math and I need some help. The problems below are from my pop quiz out of the text book i gotta hand in on monday. I can't ahve my aad or mom checkin this cause they have no clue on this but i did the problems and need feed bac.
solve the system using linear combination method
12. 3x+ 2yz=8
3x+4y+5z=14
x3y+4z=14
(my answer was (1,1,3))
16. x+y2z=5
x+2y+z=8
2x+3yz=13
(my answer was infinite solution)
18. 2x+y+6z=1
3x+2y+5z=16
7x+3y4z=11
(my answer was in fraction form but she said no solutions were fractions)

#12 and 16 are correct
check your arithmetic for 18
I got (4,3,2) and those values work for all 3 equations.
(You do know that you can check your answer yourself by merely substituting your values into each equation, don't you?)