Mathematics.Algebra - ChatArea.com

Mathematics Forum

Author	Message / Information
katmath Quote \| Reply \|	Solve by addition method posted on: 3/2/2006 12:35:26 AM 3x+4y=-5 5x+6y=-7 HELP I have lost my brain and I cannot get it back.
The Riemann Hypothesis Quote \| Reply \|	Solve by addition method replied on: 3/2/2006 11:40:45 PM 3X + 4Y = -5 ......(1) 5X + 6Y = -7 ......(2) Equation (1) * 5: 15X + 20Y = -25 .....(3) Equation (2) * -3: -15X - 18Y = -21 ....(4) Equation (3) + Equation (4): 15X + 20Y = -25 + -15X - 18Y = -21 = 0X + 2Y = -46 Y = -23 You find X. I'm too lazy.
katmath Quote \| Reply \|	Solve by addition method replied on: 3/3/2006 2:38:38 PM Thanks Rieman Hyposthesis, can someone else help me find X. I am struggling with algebra. I wish that I could just "GET IT". Thanks ever so much....
The Riemann Hypothesis Quote \| Reply \|	Solve by addition method replied on: 3/4/2006 4:19:37 AM 3X + 4Y = -5 and y = -23 as we have previously found Substituting Y: 3X + 4(-23) = -5 3X + -92 = -5 3X = -5 + 92 3X = 87 X = 29
prasannasagar_m Quote \| Reply \|	Solve by addition method replied on: 12/15/2006 12:36:56 AM the solution above is wrong dudes 3x+4y=-5 ----(1) 5x+6y=-7 ----(2) (1)6 => 18x+24y = -30 (2)4 => 20x+24y=-28 substract first eq from second => 2x =2 => x=1 put this in (1) y=-2
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