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rebecca1233

  • 3 years ago

Which system has (1, 3) as the solution? Which system has infinite solutions? Which system has (-8, 0) as the solution? Which system has no solutions? Which system has (-2, -2) as the solution? A) x + y = -1 4x + 4y = -4 B) x - 4y = -8 2x - 3y = -16 C) x + y = -4 -3x + 2y = 2 D) 4x + 6y = -12 2x + 3y = 9 E) x - y = -2 3x - y = 0

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  1. annas
    • 3 years ago
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    A) 4x+4y=-4(multi eq 1 with 4) 4x+4y=-4 subtract both eq we'll get 0 = 0

  2. rebecca1233
    • 3 years ago
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    thats a right ?

  3. rebecca1233
    • 3 years ago
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    wait thats the 4th one so A= 4

  4. rebecca1233
    • 3 years ago
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    or a = 2

  5. annas
    • 3 years ago
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    B) 2x - 8y = -16(multi eq1 with 2) 2x - 3y = -16 subtracting both eqs -5y = 0 y=0 x= -8 (-8,0)

  6. annas
    • 3 years ago
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    A system of eq has no solution

  7. rebecca1233
    • 3 years ago
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    so A= is the 4th one like i said

  8. annas
    • 3 years ago
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    yes

  9. rebecca1233
    • 3 years ago
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    what bout the other two

  10. annas
    • 3 years ago
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    can you solve the rest ???

  11. rebecca1233
    • 3 years ago
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    Which system has (1, 3) as the solution?

  12. annas
    • 3 years ago
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    B system of eq has solution set = (-8,0)

  13. rebecca1233
    • 3 years ago
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    E) x - y = -2 3x - y = 0

  14. rebecca1233
    • 3 years ago
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    that is correct right ?

  15. annas
    • 3 years ago
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    wait

  16. annas
    • 3 years ago
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    E) x - y = -2 3x - y = 0 subtracting both eqs -2x=-2 x= 1 y=3 (1,3) yes E has solution set (1,3)

  17. rebecca1233
    • 3 years ago
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    Thought so..

  18. rebecca1233
    • 3 years ago
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    is c the last option

  19. annas
    • 3 years ago
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    C)2x +2 y = -8(multi with 2) -3x + 2y = 2 subtract both eqs 5x=-10 x= -2 y=-2 (-2,-2) C has solution set (-2,-2)

  20. rebecca1233
    • 3 years ago
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    so i am right :)

  21. annas
    • 3 years ago
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    yes :)

  22. rebecca1233
    • 3 years ago
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    then D is the second one

  23. annas
    • 3 years ago
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    D) 4x + 6y = -12 4x + 6y = 18(multi by 2) subtract both eqs 0 = -30 so D has infinite solutions

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