Problem to solve
Solve \[4x-3y=7\], \[2x-3y+z=7\], \[4x-y+z=-8\]
Solution
STEP 1
Solve the following system: {-3 y + 4 x = 7 2 x - 3 y + z = 7 4 x - y + z = -8
STEP 2
Express the system in matrix form: (4 | -3 | 0 2 | -3 | 1 4 | -1 | 1)(x y z) = (7 7 -8)
STEP 3
Solve the system with Cramer's rule: x = 7 | -3 | 0 7 | -3 | 1 -8 | -1 | 1/4 | -3 | 0 2 | -3 | 1 4 | -1 | 1 and y = 4 | 7 | 0 2 | 7 | 1 4 | -8 | 1/4 | -3 | 0 2 | -3 | 1 4 | -1 | 1 and z = 4 | -3 | 7 2 | -3 | 7 4 | -1 | -8/4 | -3 | 0 2 | -3 | 1 4 | -1 | 1
STEP 4
Evaluate the determinant 4 | -3 | 0 2 | -3 | 1 4 | -1 | 1 = -14: x = 7 | -3 | 0 7 | -3 | 1 -8 | -1 | 1/(-14) and y = 4 | 7 | 0 2 | 7 | 1 4 | -8 | 1/(-14) and z = 4 | -3 | 7 2 | -3 | 7 4 | -1 | -8/(-14)
STEP 5
Simplify 7 | -3 | 0 7 | -3 | 1 -8 | -1 | 1/(-14): x = -1/14 7 | -3 | 0 7 | -3 | 1 -8 | -1 | 1 and y = 4 | 7 | 0 2 | 7 | 1 4 | -8 | 1/(-14) and z = 4 | -3 | 7 2 | -3 | 7 4 | -1 | -8/(-14)
STEP 6
Simplify 4 | 7 | 0 2 | 7 | 1 4 | -8 | 1/(-14): x = -(7 | -3 | 0 7 | -3 | 1 -8 | -1 | 1)/14 and y = -1/14 4 | 7 | 0 2 | 7 | 1 4 | -8 | 1 and z = 4 | -3 | 7 2 | -3 | 7 4 | -1 | -8/(-14)
STEP 7
Simplify 4 | -3 | 7 2 | -3 | 7 4 | -1 | -8/(-14): x = -(7 | -3 | 0 7 | -3 | 1 -8 | -1 | 1)/14 and y = -(4 | 7 | 0 2 | 7 | 1 4 | -8 | 1)/14 and z = -1/14 4 | -3 | 7 2 | -3 | 7 4 | -1 | -8
STEP 8
Evaluate the determinant 7 | -3 | 0 7 | -3 | 1 -8 | -1 | 1 = 31: x = (-1)/14×31 and y = -(4 | 7 | 0 2 | 7 | 1 4 | -8 | 1)/14 and z = -(4 | -3 | 7 2 | -3 | 7 4 | -1 | -8)/14
STEP 9
(-1)/14×31 = (-31)/14: x = -31/14 and y = -(4 | 7 | 0 2 | 7 | 1 4 | -8 | 1)/14 and z = -(4 | -3 | 7 2 | -3 | 7 4 | -1 | -8)/14
STEP 10
Evaluate the determinant 4 | 7 | 0 2 | 7 | 1 4 | -8 | 1 = 74: x = (-31)/14 and y = (-1)/14×74 and z = -(4 | -3 | 7 2 | -3 | 7 4 | -1 | -8)/14
STEP 11
(-1)/14×74 = (-37)/7: x = (-31)/14 and y = -37/7 and z = -(4 | -3 | 7 2 | -3 | 7 4 | -1 | -8)/14
STEP 12
Evaluate the determinant 4 | -3 | 7 2 | -3 | 7 4 | -1 | -8 = 62: x = (-31)/14 and y = (-37)/7 and z = (-1)/14×62
STEP 13
(-1)/14×62 = (-31)/7: Answer: | | x = (-31)/14 and y = (-37)/7 and z = -31/7
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