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anonymous

  • 5 years ago

give the ordered pair that satisfies the system of equations below... x= -5y-7 4x + 5y = 17 someone please help me! i really dont understand it. can you please indicate me what to do!

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  1. myininaya
    • 5 years ago
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    ok you see x=-5y-7 plug that x into the other equation 4(-5y-7)+5y=17

  2. myininaya
    • 5 years ago
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    now solve for y

  3. anonymous
    • 5 years ago
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    first you would distribute 4 right?? omg this is highschool stuff and im only in middle school! -_-

  4. myininaya
    • 5 years ago
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    yes

  5. myininaya
    • 5 years ago
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    -20y-28+5y=17 now what

  6. anonymous
    • 5 years ago
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    plus 28 on both sides. meaning you wud cancel out -28 and add 28 to 17

  7. anonymous
    • 5 years ago
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    wait i got -25y - 28 = 17

  8. anonymous
    • 5 years ago
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    i combined like terms.

  9. anonymous
    • 5 years ago
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    then i ended up with -25y = 45

  10. myininaya
    • 5 years ago
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    -15y=45 y=-3

  11. anonymous
    • 5 years ago
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    ahhh thanks. my bad.

  12. anonymous
    • 5 years ago
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    then what do i do? i have to give the ordered pairs.

  13. myininaya
    • 5 years ago
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    what is x if y=-3

  14. myininaya
    • 5 years ago
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    remember x=-5y-7 and we know y=-3 so x=?

  15. anonymous
    • 5 years ago
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    yeah. so x = 8 ! omggg

  16. anonymous
    • 5 years ago
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    you've made my life so much easier

  17. anonymous
    • 5 years ago
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    my teacher taught it to me in an impossible way. thank you so much.

  18. anonymous
    • 5 years ago
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    you taught me in a different way.

  19. myininaya
    • 5 years ago
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    the ordered pair (x,y)=(8,-3)

  20. anonymous
    • 5 years ago
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    yeah. i got it! thank you so much!

  21. myininaya
    • 5 years ago
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    there are other ways to solve this types i like substitution the most thats what we did above

  22. anonymous
    • 5 years ago
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    my teacher told me to put it in y=mx + b form. but i didnt know how to do that.

  23. myininaya
    • 5 years ago
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    solve both of them for y

  24. anonymous
    • 5 years ago
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    what do you mean?

  25. myininaya
    • 5 years ago
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    x=-5y-7 add 7 to both sides x+7=-5y now divide by -5 on both sides (x+7)/(-5)=y y=x/(-5)+7/(-5) y=-x/5-7/5 the other equation...

  26. myininaya
    • 5 years ago
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    4x+5y=17 solve for y we subtract 4x on both sides 5y=-4x+17 now divide by 5 y=(-4x+17)/5 y=-4x/5+17/5

  27. myininaya
    • 5 years ago
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    to see where the lines intersect set them equal after putting both in y=mx+b form so we have -x/5-7/5=-4x/5+17/5 we can get rid of the fractions by multiplying both sides by 5 so we have -x-7=-4x+17

  28. anonymous
    • 5 years ago
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    this one seems more complicated.

  29. myininaya
    • 5 years ago
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    solve the above this equation for x by first add 4x on both sides 3x-7=17 adding 7 3x=24 x=8 to find out what y is we just plug into either y=-4x/5+17/5 or y=-x/5-7/5 so if x=8, y=-8/5-7/5=-15/5=-3 so the ordered pair is (x,y)=(8,-3)

  30. anonymous
    • 5 years ago
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    ahhh. but i like the other way better. this one seems like more work. but i find the other one easier.

  31. anonymous
    • 5 years ago
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    wait, can you see if im right on this other one i did.

  32. anonymous
    • 5 years ago
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    y= 1/2x - 2 ( a half times x minus 2 ) y= -3x +5

  33. anonymous
    • 5 years ago
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    i got (1, -2 )

  34. anonymous
    • 5 years ago
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    i plotted these equations and choose the ordered pair below where these lines intersect.

  35. myininaya
    • 5 years ago
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    x/2-2=-3x+5 x-4=-6x+10 7x=14 x=2 so y=-3(2)+5=-1 (x,y)=(2,-1)

  36. anonymous
    • 5 years ago
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    where did x/2 come from?

  37. myininaya
    • 5 years ago
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    isn't that 1/2 * x up there?

  38. anonymous
    • 5 years ago
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    nevermind. i got it.

  39. anonymous
    • 5 years ago
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    can you explain to me how you got x-4 = -6x + 10 what did you multiply?

  40. myininaya
    • 5 years ago
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    i just got rid of the fractions by multiplying both sides by 2

  41. anonymous
    • 5 years ago
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    hmmm. so you multiplied the reciprocal of x/2

  42. anonymous
    • 5 years ago
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    which is 2/x then you multiplied that by -2 and -3 and positive 5.

  43. anonymous
    • 5 years ago
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    and thats how you got your answer right?

  44. myininaya
    • 5 years ago
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    no i multiplied by 2 not 2/x

  45. myininaya
    • 5 years ago
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    2(x/2)-2(2)=2(-3x)+2(5) x-4=-6x+10

  46. anonymous
    • 5 years ago
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    gotcha

  47. anonymous
    • 5 years ago
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    thank you so much!

  48. myininaya
    • 5 years ago
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    np

  49. anonymous
    • 5 years ago
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    can you please help me with another one?

  50. anonymous
    • 5 years ago
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    im not good in algebra 1 im only in 8th grade and this is hs stuff.

  51. anonymous
    • 5 years ago
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    hello.

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