Systems of Three Equations Substitution - Kuta Software
Kuta Software - Infinite Algebra 2
Name___________________________________
Solving Systems of Three Equations w/ Substitution Date________________ Period____
Solve each system by substitution.
1) -x - y - 3z = -9 z = -3x - 1 x = 5 y - z + 23
2) x = -4z - 19 y = 5x + z - 4 -5 y - z = 25
3) y = x + z + 5 z = -3 y - 3 2x - y = -4
4) -2 y + 5z = -3 y = -5x - 4z - 5 x = 4z + 4
5) y = x + 4z - 5 4x + 3y - 2z = 5 z = -2x + 2
6) x = 3 y - 3z + 8 z = 4x + 5y - 14 3 y + 2z = 14
7) -5x - 3 y + z = -4 -2x - 2y + 2z = 4 z = x + 5
8) -4x + 2z = 14 y = x + z + 12 -2x - 4z = 22
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Worksheet by Kuta Software LLC
9) 3x - 3 y = -6 z = -3x - 3y + 9 -4x + 5y + z = 8
10) x = -5 y + 4z + 1 x - 2 y + 3z = 1 2x + 3y - z = 2
11) a - 2b + c = -6 a + 5c = -12 -a + 6b + 4c = 3
12) -2x + 3 y + 5z = -21 -4z = 20 6x - 3y = 0
13) 2x - 4z = 20 -3x + y - 4z = 20 -4x + 2 y + 3z = -15
14) x + 3 y = -17 3x = -6 4x - 3 y + 6z = 25
15) 5r + 4s - 6t = -24 -2s + 2t = 0 s - t = 2
16) -5r + 5s + 3t = -23 -5r + 3s - 3t = -11 -6r + 6t = -12
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Worksheet by Kuta Software LLC
Kuta Software - Infinite Algebra 2
Name___________________________________
Solving Systems of Three Equations w/ Substitution Date________________ Period____
Solve each system by substitution.
1) -x - y - 3z = -9 z = -3x - 1 x = 5 y - z + 23
(-2, -4, 5)
2) x = -4z - 19 y = 5x + z - 4 -5 y - z = 25
(1, -4, -5)
3) y = x + z + 5 z = -3 y - 3 2x - y = -4
(-2, 0, -3)
4) -2 y + 5z = -3 y = -5x - 4z - 5 x = 4z + 4
(0, -1, -1)
5) y = x + 4z - 5 4x + 3y - 2z = 5 z = -2x + 2
(0, 3, 2)
6) x = 3 y - 3z + 8 z = 4x + 5y - 14 3 y + 2z = 14
(2, 2, 4)
7) -5x - 3 y + z = -4 -2x - 2y + 2z = 4 z = x + 5
(0, 3, 5)
8) -4x + 2z = 14 y = x + z + 12 -2x - 4z = 22
(-5, 4, -3)
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Worksheet by Kuta Software LLC
9) 3x - 3 y = -6 z = -3x - 3y + 9 -4x + 5y + z = 8
(1, 3, -3)
10) x = -5 y + 4z + 1 x - 2 y + 3z = 1 2x + 3y - z = 2
No unique solution
11) a - 2b + c = -6 a + 5c = -12 -a + 6b + 4c = 3
(3, 3, -3)
13) 2x - 4z = 20 -3x + y - 4z = 20 -4x + 2 y + 3z = -15
(0, 0, -5)
12) -2x + 3 y + 5z = -21 -4z = 20 6x - 3y = 0
(1, 2, -5)
14) x + 3 y = -17 3x = -6 4x - 3 y + 6z = 25
(-2, -5, 3)
15) 5r + 4s - 6t = -24 -2s + 2t = 0 s - t = 2
No unique solution
16) -5r + 5s + 3t = -23 -5r + 3s - 3t = -11 -6r + 6t = -12
(1, -3, -1)
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Worksheet by Kuta Software LLC
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