URGENT PLEASE HELP!!
can you please just check my answers? if its wrong please tell me the answer and how u got it thanks (:

Solve each system by using the best method
1. 3x + 4y = -4
x = -2y + 2
answer i got: x=8 y=5

2.) 2x - 5y - 10
-3x + 4y = -15
answer: x=5 y=0

3.) 4x + 4y - 2z = -8
-3x + y + 4 = 20
2x - 2y +3z = -4
answer: x=-3 y=-7 z=-4

4) x - 3y + 6z = 21
3x + 2y - 5z = -30
2x - 5y + 2z = -6
answer: x=-3 y=2 z=5

Question

URGENT PLEASE HELP!!
can you please just check my answers? if its wrong please tell me the answer and how u got it thanks (:

Solve each system by using the best method
1. 3x + 4y = -4
    x = -2y + 2
answer i got: x=8 y=5

2.) 2x - 5y - 10
    -3x + 4y = -15
answer: x=5 y=0

3.) 4x + 4y - 2z = -8
     -3x + y + 4 = 20 
     2x - 2y +3z = -4
answer: x=-3 y=-7 z=-4


4) x - 3y + 6z = 21
    3x + 2y - 5z = -30
   2x - 5y + 2z = -6
answer: x=-3 y=2 z=5

anonymous · Answer

first one should be $(-8,5)$ i think

anonymous · Answer

in fact i am sure http://www.wolframalpha.com/input/?i=+3x+%2B+4y+%3D+-4+%2Cx+%3D+-2y+%2B+2

anonymous · Answer

x should be -8?

anonymous · Answer

yes

anonymous · Answer

omfg thank you for that site lol

anonymous · Answer

yeah, note the syntax
put a comma between the two equations, and it will give you the solution