Problem to solve
Solve \[x-y+3z=2\], \[2x-3y=-4\], \[x+y+z=-2\]
Solution
STEP 1
Solve the following system: {x - y + 3 z = 2 -3 y + 2 x = -4 x + y + z = -2
STEP 2
Express the system in matrix form: (1 | -1 | 3 2 | -3 | 0 1 | 1 | 1)(x y z) = (2 -4 -2)
STEP 3
Write the system in augmented matrix form and use Gaussian elimination: (1 | -1 | 3 | 2 2 | -3 | 0 | -4 1 | 1 | 1 | -2)
STEP 4
Swap row 1 with row 2: (2 | -3 | 0 | -4 1 | -1 | 3 | 2 1 | 1 | 1 | -2)
STEP 5
Subtract 1/2 × (row 1) from row 2: (2 | -3 | 0 | -4 0 | 1/2 | 3 | 4 1 | 1 | 1 | -2)
STEP 6
Multiply row 2 by 2: (2 | -3 | 0 | -4 0 | 1 | 6 | 8 1 | 1 | 1 | -2)
STEP 7
Subtract 1/2 × (row 1) from row 3: (2 | -3 | 0 | -4 0 | 1 | 6 | 8 0 | 5/2 | 1 | 0)
STEP 8
Multiply row 3 by 2: (2 | -3 | 0 | -4 0 | 1 | 6 | 8 0 | 5 | 2 | 0)
STEP 9
Swap row 2 with row 3: (2 | -3 | 0 | -4 0 | 5 | 2 | 0 0 | 1 | 6 | 8)
STEP 10
Subtract 1/5 × (row 2) from row 3: (2 | -3 | 0 | -4 0 | 5 | 2 | 0 0 | 0 | 28/5 | 8)
STEP 11
Multiply row 3 by 5/4: (2 | -3 | 0 | -4 0 | 5 | 2 | 0 0 | 0 | 7 | 10)
STEP 12
Divide row 3 by 7: (2 | -3 | 0 | -4 0 | 5 | 2 | 0 0 | 0 | 1 | 10/7)
STEP 13
Subtract 2 × (row 3) from row 2: (2 | -3 | 0 | -4 0 | 5 | 0 | -20/7 0 | 0 | 1 | 10/7)
STEP 14
Divide row 2 by 5: (2 | -3 | 0 | -4 0 | 1 | 0 | -4/7 0 | 0 | 1 | 10/7)
STEP 15
Add 3 × (row 2) to row 1: (2 | 0 | 0 | -40/7 0 | 1 | 0 | -4/7 0 | 0 | 1 | 10/7)
STEP 16
Divide row 1 by 2: (1 | 0 | 0 | -20/7 0 | 1 | 0 | -4/7 0 | 0 | 1 | 10/7)
STEP 17
Collect results: Answer: | | {x = -20/7 y = -4/7 z = 10/7
More problems
Number
001Solve \(3x+2y=5\), \(-4x+5y=2\)
002Solve \(-4x+5y+3=x+4\), \(6x-7y=2y-1\)
003Solve \(-5x+2y=-3+2x\), \(4x-2y+3=7-4x\)
004Solve \(3y+5x+1-2y=2y-3\), \(3y-2+5x=2x-3y+2\)
005Solve \(3x+5y=2\), \(-5x+6y=5\)
006Solve \(-\frac{2}{3}x+5y=4\), \(7x-5y=4\)
007Solve \( 4x-5y=3\), \(-2x+6y=-2\)
008Solve \(\frac{6}{5}x+\frac{3}{2}y=5\), \(-\frac{3}{5}x+y=5y+2\)
009Solve \(\frac{3}{2}x-\frac{1}{2}y=6x-2\), \(3x+\frac{2}{3}y=-2y-1\)
010Solve \(-2x+6y-4x=5x-3y+3\), \(7y+4x=9-2y\)
011Solve \(\frac{2x+y}{3}-\frac{2(x+y)}{4}=2\), \(-\frac{2(x-y)}{5}-\frac{x+2y}{2}=-1\)
012Solve \(-\frac{2(x-y)}{5}+\frac{2x-y}{2}=-1\), \(4(2x+3)-\frac{3x-4y}{2}=5\)
013Solve \(\frac{x+2}{2}+\frac{3y-1}{4}=-1\), \(2x+y-2(3x-4y)=x+3\)
014Solve \(\frac{2x-1}{4}+\frac{x-2y}{3}=4+x\), \(\frac{x+y}{3}-(x-y)=-2y+1\)
015Solve \(3(x-5y)+2(2x-1)=2(x-y)\), \(2(x-1)-3(x-y)=-3x\)
016Solve \(x-y+3z=2\), \(2x-3y=-4\), \(x+y+z=-2\)
017Solve \(-4x+y-5z=2\), \(4x+2y+z=1\), \(2x-y+3z=4\)
018Solve \(-10x+3y+z=-2\), \(3x-2y+5z=4\), \(-6x+4y+2z=1\)
019Solve \(4x-3y=7\), \(2x-3y+z=7\), \(4x-y+z=-8\)
020Solve \(-x+3y+2z=5\), \(-3x-2y+z=-4\), \(x-y+z=3\)
021Solve \(\frac{x}{3}-\frac{y}{2}+z=2\), \(-x-\frac{y}{3}+2z=3\), \(2x-3y+\frac{z}{3}=-1\)
022Solve \(2x-\frac{y}{3}+2z=-1\), \(x+y+\frac{z}{2}=-1\), \(x-2y+z=2\)
023Solve \(-\frac{3x}{2}+3y+z=2\), \(3x-y+z=5\), \(\frac{x}{3}-y+z=2\)
024Solve \(\frac{2x}{3}-2z=-2\), \(2y-4z=2\), \(\frac{x}{3}-5y=2\)
025Solve \(\frac{x}{2}-3z=-2\), \(3y-\frac{z}{2}=2\), \(x+3y-z=5\)
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Edited by tododemate® - 2021