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yayasims21

  • 3 years ago

need help solve this equation using the elimination method 6x – 4y = 54 –9x + 2y = –69

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  1. ajprincess
    • 3 years ago
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    Multiply the second equation by 2 nd can u plz tell me vat u get?

  2. yayasims21
    • 3 years ago
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    -18+4y=-138

  3. ajprincess
    • 3 years ago
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    yup good:) nw add this one with the first equation. terms with variable y will be elimnated. then solve for x. can u do it @yayasims21

  4. yayasims21
    • 3 years ago
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    i cannt can u do it

  5. ajprincess
    • 3 years ago
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    plz give it a try. if u face any difficulty when doing it plz ask. I will help u:)

  6. yayasims21
    • 3 years ago
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    ok so im suppose to add -18+4y=-138 to 6x-4y=54

  7. ajprincess
    • 3 years ago
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    ya:)

  8. yayasims21
    • 3 years ago
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    i cant do it my calculator wont let me

  9. ajprincess
    • 3 years ago
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    -18x+4y+6x-4y=-138+54 (-18x+6x)+(4y-4y)=-138+54 See if u can do it nw:)

  10. ajprincess
    • 3 years ago
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    Add the ones inside the parentheses

  11. yayasims21
    • 3 years ago
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    i cant do it i really suck at math

  12. ajprincess
    • 3 years ago
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    what is -18x+6x?

  13. yayasims21
    • 3 years ago
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    -12

  14. ajprincess
    • 3 years ago
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    -12x. what is 4y-4y?

  15. yayasims21
    • 3 years ago
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    0

  16. ajprincess
    • 3 years ago
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    yup right:) what is -138+54

  17. yayasims21
    • 3 years ago
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    -84

  18. ajprincess
    • 3 years ago
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    yup good. nw combine these results.

  19. yayasims21
    • 3 years ago
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    add them

  20. ajprincess
    • 3 years ago
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    ya.

  21. yayasims21
    • 3 years ago
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    i get -96

  22. TheViper
    • 3 years ago
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    @ajprincess happy new year & to @yayasims21 too :)

  23. yayasims21
    • 3 years ago
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    o thanks happy new year to u 2

  24. TheViper
    • 3 years ago
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    :)

  25. ajprincess
    • 3 years ago
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    no. remember u can add -12x with -84. nd -84 is in the right side of the equal aign. -18x+6x+4y-4y=-138+54 -12x+0=-84 -12x=-84 Divide by -12 both sides to find x. Thanx @TheViper and I wish u the same:)

  26. TheViper
    • 3 years ago
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    :)

  27. yayasims21
    • 3 years ago
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    -12 divided by -12 is 1 and -84 is 7

  28. ajprincess
    • 3 years ago
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    remember u r dividing -12x by -12 nt -12. this leaves u with x and u r right abt getting 7:)

  29. ajprincess
    • 3 years ago
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    So ur x becomes 7. To find y plug in this value in either 6x – 4y = 54 or –9x + 2y = –69 and solve

  30. yayasims21
    • 3 years ago
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    ok wat do u mean how am i suppose to do tht

  31. ajprincess
    • 3 years ago
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    x=7. Plug this in 6x-4y=54 6(7)-4y=54 42-4y=54 1.Subtract 42 both sides. 2.Divide by -4 both sides to find y.

  32. yayasims21
    • 3 years ago
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    i cant do this im so confused

  33. ajprincess
    • 3 years ago
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    42-4y=54 1.Subtract 42 both sides. 2.Divide by -4 both sides to find y.

  34. ajprincess
    • 3 years ago
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    Plz follow the steps

  35. yayasims21
    • 3 years ago
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    i am but so im suppose to subtract 42from -9

  36. ajprincess
    • 3 years ago
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    no. let me do one step and show. 42-4y=54 Subtract 42 both sides 42-42-4y=54-42 0-4y=12 -4y=12 Nw divide by -4 both sides to find y

  37. yayasims21
    • 3 years ago
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    -3x

  38. ajprincess
    • 3 years ago
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    -4y=12 Divide by -4 both sides (-4y)/-4=12/-4 y=-3

  39. yayasims21
    • 3 years ago
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    ok i got it is there anymore we have to do

  40. ajprincess
    • 3 years ago
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    nope. evrythng is done:)

  41. yayasims21
    • 3 years ago
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    ok well can u show this all at once so i can write it down

  42. yayasims21
    • 3 years ago
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    can you @ajprincess

  43. ajprincess
    • 3 years ago
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    Extremely sorrry @yayasims21. busy right nw.

  44. yayasims21
    • 3 years ago
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    o alright illtry to put it together

  45. ajprincess
    • 3 years ago
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    hav u finished @yayasims21?

  46. ajprincess
    • 3 years ago
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    \(6x-4y=54-(1)\) \(-9x+2y=-69-(2)\) (2)*2=>\(-18x+4y=-138-(3)\) (3)+(1)=>\(-18x+4y+6x-4y=-138+54\) \(-12x=-84\) \(-12x/-12=-84/-12\) \(x=7\) Substituting this in (1)=> \(6(7)-4y=54\) \(42-4y=54\) \(-4y=54-42\) \(-4y=12\) \(-4y/-4=12/-4\) \(y=-3\)

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