I itsmelana New member Joined Jul 26, 2008 Messages 11 Aug 5, 2008 #1 Please check this for me.... Solve the following system using substitution: x + 3y = -3 9y = -3x - 9 ------------------------ x= -3y-3 3y-3 for 9y= -3(-3y-3) - 9 9y=9y No Solution
Please check this for me.... Solve the following system using substitution: x + 3y = -3 9y = -3x - 9 ------------------------ x= -3y-3 3y-3 for 9y= -3(-3y-3) - 9 9y=9y No Solution
tkhunny Moderator Staff member Joined Apr 12, 2005 Messages 11,325 Aug 5, 2008 #2 Re: Algebra itsmelana said: Please check this for me.... Solve the following system using substitution: x + 3y = -3 9y = -3x - 9 ------------------------ x= -3y-3 3y-3 for 9y= -3(-3y-3) - 9 9y=9y No Solution Click to expand... Your algebra is good. Your conclusion is bad. What value for x makes y = y? Hint: 9y = -3x - 9 ==> 3x+ 9y = -9 ==> x + 3y = -3 ==> The TWO lines really are the SAME line.
Re: Algebra itsmelana said: Please check this for me.... Solve the following system using substitution: x + 3y = -3 9y = -3x - 9 ------------------------ x= -3y-3 3y-3 for 9y= -3(-3y-3) - 9 9y=9y No Solution Click to expand... Your algebra is good. Your conclusion is bad. What value for x makes y = y? Hint: 9y = -3x - 9 ==> 3x+ 9y = -9 ==> x + 3y = -3 ==> The TWO lines really are the SAME line.
