K kathy's New member Joined Dec 20, 2005 Messages 47 Mar 9, 2006 #1 I don't know were to begin I have to solve this question by using algebraic method: 1) 3x= -12 2) 1= x+y+2z 3) 2x-y= -9 can you help me? Thanks
I don't know were to begin I have to solve this question by using algebraic method: 1) 3x= -12 2) 1= x+y+2z 3) 2x-y= -9 can you help me? Thanks
D Denis Senior Member Joined Feb 17, 2004 Messages 1,700 Mar 9, 2006 #2 kathy's said: 1) 3x= -12 2) 1= x+y+2z 3) 2x-y= -9 Click to expand... Hmmm...looks familiar...anyway: 1): x = -12/3 = -4 ; ok? Substitute that in 3): 3): 2(-4) - y = -9 y = 1 ; ok? Now finish off by substituting x=-4 and y=1 in 2); if you can't, you need more help than you can get here...your teacher :!:
kathy's said: 1) 3x= -12 2) 1= x+y+2z 3) 2x-y= -9 Click to expand... Hmmm...looks familiar...anyway: 1): x = -12/3 = -4 ; ok? Substitute that in 3): 3): 2(-4) - y = -9 y = 1 ; ok? Now finish off by substituting x=-4 and y=1 in 2); if you can't, you need more help than you can get here...your teacher :!:
