Solve the system of equations.
3x + 2y + z = 10
9x - 6y+z = 0
x-y-3z = -10

x = 1

y = 2

z = 3

Step-by-step explanation:

3x + 2y + z = 10 | ×3 |

9x - 6y + z = 0 | ×1 |

9x + 6y + 3z = 30

9x - 6y + z = 0

--

12y + 2z = 30 (4)

3x + 2y + z = 10 | ×1 |

x - y - 3z = -10 | ×3 |

3x + 2y + z = 10

3x - 3y - 9z = -30

--

5y + 10z = 40 (5)

4 and 5

12y + 2z = 30 | ×5 |

5y + 10z = 40 | ×1 |

60y + 10z = 150

5y + 10z = 40

--

55y = 110

y = 110/55

y = 2

5y + 10z = 40

5(2) + 10z = 40

10 + 10z = 40

10z = 40 - 10

10z = 30

z = 30/10

z = 3

x - y - 3z = -10

x - 2 - 3(3) = -10

x - 2 - 9 = -10

x - 11 = -10

x = -10 + 11

x = 1

4 + 5 7/9= 9 7/9

step-by-step explanation:

b

step-by-step explanation:

it have 5 sides and 5 identicle angle.the rest does not have the same property as b.

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