anonymous
  • anonymous
please someone help me solve this equation step by step solve by elimination 5x+2y=-7 7x-3y=11
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
anonymous
  • anonymous
1st multiply the top equation by 3 and the bottom by 2 to be able to eliminate the y components
anonymous
  • anonymous
5x + 2y = -7 |x3| --> 15x+6y = -21 7x - 3y = 11 |x2| --> 14x-6y=22 you got x, then search for y
anonymous
  • anonymous
what she said ha

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anonymous
  • anonymous
Do you understand?
anonymous
  • anonymous
after multiplying by 3 and 2 i add the 2 equations together to get x right
anonymous
  • anonymous
1/29?
anonymous
  • anonymous
yes thats correct for x now plug that back into one of the equations to solve for y
anonymous
  • anonymous
ok this is where i keep getting stuck i can not for the life of me figure out how to do that
anonymous
  • anonymous
what numbers do i multiply or whatever im suppose to do
anonymous
  • anonymous
5x+2y=-7 change x with 1/29
anonymous
  • anonymous
5(1/29) + 2y = -7 2y = -7 - (5/29) So. y = [-7-(5/9)] / 2
anonymous
  • anonymous
so then is the answer 70/29
anonymous
  • anonymous
cant be im so confused
anonymous
  • anonymous
no, the answer is x = 1/29 and y = -3.59
anonymous
  • anonymous
thats where i keep getting stuck, how u got that for y, will u put it in laimens terms
anonymous
  • anonymous
5(1/29) + 2y = -7 2y = -7 - (5/29) So. y = [-7-(5/9)] / 2 --> = -3.59
anonymous
  • anonymous
just follow what I did there and you should get it
anonymous
  • anonymous
5(1/29) + 2y = -7 --> 5/29 +2y=-7 2y = -7 - (5/29) 2y = (-203-5)/29 2y = -208/29 y = -208/29 * 1/2 y = -104/29
anonymous
  • anonymous
ok, but im still confused i am really really bad when it comes to this type of math it helps me to make notes how did you get the -203? i need explanations for every answer except the obvious ones
anonymous
  • anonymous
make -7 in a fraction with denominator is 29, 29*-7=-203
anonymous
  • anonymous
ok and then u subtract -5 from that
anonymous
  • anonymous
okay I will walk you through it: So we have x= 1/29 now you know how we got that so plug 1/29 into 5x + 2y = -7 This becomes 5(1/29) + 2y = -7 -----> 5(1/29) = 5/29 So, subtract 5/29 from both sides: 2y = -7 - (5/29) -------Evaluate that Then divide by 2: Then y = [-7-(5/29)] / 2 and y = -3.59 So x = 1/29 and y = -3.59
anonymous
  • anonymous
the solution is (1/29,-104/29)
anonymous
  • anonymous
-104/29 is a fraction form from -3.59
anonymous
  • anonymous
yeah you can leave it in fraction form its more accurate, I just evaluated it
anonymous
  • anonymous
ok ty so much for you guys help and the trouble it took, thank you for being patient with me
anonymous
  • anonymous
hehe not a problem
anonymous
  • anonymous
no problem glad we could help!
anonymous
  • anonymous
tina, you understood the procedure, right?
anonymous
  • anonymous
I am seeing her on this place through out the day. Is something wrong Ms Holman
anonymous
  • anonymous
need help solving this equation step by step soybean meal is 18% protein, cornmeal is 9% protein how many lbs of each should be mixed together to get 360lb mixture that is 15%

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