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Griffindore

  • one year ago

hey i have 2 quick questions if anyone can help

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  1. Griffindore
    • one year ago
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    A student is trying to solve the system of two equations given below: Equation P: y + z = 6 Equation Q: 3y + 4z = 1 Which of the following is a possible step used in eliminating the y-term?

  2. anonymous
    • one year ago
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    is this type a typed answer?

  3. Griffindore
    • one year ago
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    (y + z = 6) ⋅ 4 (3y + 4z = 1) ⋅ 4 (y + z = 6) ⋅ −3 (3y + 4z = 1) ⋅ 3

  4. mathstudent55
    • one year ago
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    To eliminate a variable, you need to add the equations or multiples of the equations in which the same variable in both equations will add to zero.

  5. anonymous
    • one year ago
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    In order to elminiate any term from an equation when you have multiple equations .. U've to multiply one with the first equation that will result in a "zero" when you add them up ... In Ur case, this would be the third choice :D Let me know if U got it :)

  6. Griffindore
    • one year ago
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    Ok

  7. Griffindore
    • one year ago
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    oh i get it that makes sence

  8. mathstudent55
    • one year ago
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    You want to eliminate y. The second equation has 3y. If you could change the first equation to have -3y, that would do it. Does any choice change the first equation so that the y term becomes -3y?

  9. anonymous
    • one year ago
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    sorry I meant to multiply by a constant factor :)

  10. Griffindore
    • one year ago
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    ya thats what i try but i kept getting stuck

  11. Griffindore
    • one year ago
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    can u guys help me out with one more

  12. anonymous
    • one year ago
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    Feel free :D

  13. Griffindore
    • one year ago
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    ok

  14. Griffindore
    • one year ago
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    A set of equations is given below: Equation E: c = 2d + 1 Equation F: c = 3d + 7 Which statement describes a step that can be used to find the solution to the set of equations? Equation F can be written as c = 3(c − 1) + 7. Equation F can be written as c = 2(c − 7) + 1. Equation F can be written as d + 1 = 3d + 7. Equation F can be written as 2d + 1 = 3d + 7.

  15. anonymous
    • one year ago
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    Just find d in term of c from Equation E and then plug the value in the other equation or find c in terms of d and do same steps :)

  16. anonymous
    • one year ago
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    Let's try to get c in terms of d .. To do so, U've to get c in one hand and d on the other hand in one of the equations let's say equation E .. we already have that done for us .. then plug c in equation F and see if any of the answers is what we have got

  17. mathstudent55
    • one year ago
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    Second problem. Look at the given equations. Notice they are both solved for c. Set them equal to each other. If c = 2d + 1 and c = 3d + 7, then 2d + 1 must equal 3d + 7 Which choice shows this?

  18. anonymous
    • one year ago
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    If none of them is what we got .. Then we are now sure that the answer contains no d's ! So we try the other way .. Try to get d in terms of c from Equation E and plug it in equation F as well as what we have did in the last step for c in terms of d

  19. mathstudent55
    • one year ago
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    |dw:1437419612159:dw|

  20. mathstudent55
    • one year ago
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    The answer is D

  21. mathstudent55
    • one year ago
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    Replace the c of equation F with 2d + 1, since from equation E we know that c = 2d + 1. Answer is choice D.

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