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anonymous

  • one year ago

what is the solution of the system? Y=-8x-2 and Y=-6x+4 (-3,22) (-8/3,1/22) (-14/3,6/22) (3/14,-6/14) will give medal for correct answer

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  1. pooja195
    • one year ago
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    Use susbstituion :) plug equation 1 into equation 2

  2. pooja195
    • one year ago
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    \[\huge -6x+4=-8x-2\]

  3. welshfella
    • one year ago
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    you can either solve the system or plug in the given values to see if they fit eg for first one y = 22 -8x - 2 = -8(-3) - 2 = 24 - 2 = 22 they both come to same value so thay fit for first equation Now try the same values for y = -6x + 4 and see if they fit

  4. anonymous
    • one year ago
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    i think its a

  5. welshfella
    • one year ago
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    r u sure ?

  6. welshfella
    • one year ago
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    be confident

  7. anonymous
    • one year ago
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    im not sure

  8. welshfella
    • one year ago
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    what does -6(-3) + 4 work out to?

  9. anonymous
    • one year ago
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    22

  10. welshfella
    • one year ago
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    so?

  11. anonymous
    • one year ago
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    it is a

  12. welshfella
    • one year ago
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    right

  13. anonymous
    • one year ago
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    thank you

  14. anonymous
    • one year ago
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    could you help me with this one how many solutions does the system have ? 12y=-3x+20 y=-1/4x+5/3

  15. welshfella
    • one year ago
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    yw pooja195 's method was quicker than mine though as both -6x+4 and -8x - 2 are equal to y they are equal to each other so you only needed to plug x = 3 into his equation to see if LHS = RHS

  16. welshfella
    • one year ago
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    the way to do these is to multiply one equation by a number so that the terms in y or x have the same coefficient ( the coefficient is the number in front of the x or y)

  17. welshfella
    • one year ago
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    so as we have 12y in equation 1 and y in equation 2 we multiply the second one by 12 equation 1 12y = - 3x + 20 equation 2 12y = -3x + 20 - the same equation so how many solution s does this have?

  18. anonymous
    • one year ago
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    1

  19. welshfella
    • one year ago
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    No - Hint; you can put any value of x into the equation and work out a value of y - in fact many many values of x...

  20. welshfella
    • one year ago
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    so theres not just 1 value theres ?

  21. anonymous
    • one year ago
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    infinte

  22. welshfella
    • one year ago
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    right infinite solutions

  23. anonymous
    • one year ago
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    thank you so much

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