anonymous
  • anonymous
Would anyone be so gracious as to helping me get a better understanding of the dreadful algebra!??!?!!? :) Explain, in complete sentences, how you would use the elimination method to solve the following system of equations. Provide the solution to the system. 2x + 9y = 4 3x + 7y = -7
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!
Venomblast
  • Venomblast
1st you want to figure out which variable you want to solve
anonymous
  • anonymous
X
Venomblast
  • Venomblast
ok. oh n btw i replied. the answer is A!!! fromt he previous question

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More answers

anonymous
  • anonymous
thank you love!!!! :)))))))))))) I got that answer after I "closed" the question box
Venomblast
  • Venomblast
i said it 2 times. lol anywayz let do this problem
anonymous
  • anonymous
thank you nonetheless! ok let's go!
terenzreignz
  • terenzreignz
Hey, an intermission, if you would oblige me... if x = y, then ax = ay right?
terenzreignz
  • terenzreignz
And if a = b and c = d then a + c = b + d Don't worry, these are relevant, we'll use them.
anonymous
  • anonymous
Thank you kind sir....! @terenzreignz
Venomblast
  • Venomblast
man i hate the ax=ay method
terenzreignz
  • terenzreignz
So you have 2x + 9y = 4 From our first rule, we can get 7(2x + 9y) = 7(4) 14x + 63y = 28, let's stop here, and call this "equation 1" You also have 3x + 7y = -7 Again, from our first rule, we can get -9(3x + 7y) = -9(-7) -27x - 63y = 63, stop here again, call this "equation 2" Are you getting it so far?
anonymous
  • anonymous
Yes, I've gone thru this a time before! But one question, how did you get the "7" in 7(2x+9y)
anonymous
  • anonymous
If you don't mind me asking.....! :))
anonymous
  • anonymous
Here's a joke: Subway called, they want their 6 inch back ;)
Venomblast
  • Venomblast
LOL
anonymous
  • anonymous
Another joke/flattery I made up: Verizon called, they want their "SMART" phone back
terenzreignz
  • terenzreignz
Ok... You said you wanted to solve for x first (personally, I'd have gone for y first) So, we have to somehow get rid of the y. To do that, you have to make it so that the coefficient (the number that goes beside the letter) of the y in the first equation is equal to the NEGATIVE of the coefficient of the y in the second equation. In the first equation, the coeff of y was "9" and in the second, it was "7" You need to get what's called their "least common multiple" And that's 63. 63/9 is 7, so that's what I multiply to the first equation. 63/7 is 9, so that's what I multiply to the second equation, and then I NEGATED it (multiplied it by -1)
terenzreignz
  • terenzreignz
You'll see why this is done, when I proceed... shall I?
Venomblast
  • Venomblast
please do lol
anonymous
  • anonymous
oh my god....this is actually making sense!!!!! :')
terenzreignz
  • terenzreignz
Remember our second rule? if a=b and c=d then a+c = b+d ? We'll just apply that, on a larger scale, sort of...
anonymous
  • anonymous
I remember! I will, I promise!
terenzreignz
  • terenzreignz
All right, equation 1: 14x + 63y = 28 equation 2: -27x - 63y = 63 Remember these?
anonymous
  • anonymous
I do, yes
terenzreignz
  • terenzreignz
Now we use the second rule, we add both expressions on the left, and equate them to the sum of the expressions on the right: 14x + 63y - 27x - 63y = 28 + 63
terenzreignz
  • terenzreignz
Notice something?
Venomblast
  • Venomblast
combine like term *cough**cough*
anonymous
  • anonymous
I'm writing down the steps to refer to, but yes, I notice that in order to prolong the steps, I'll have to combine
terenzreignz
  • terenzreignz
and...?
anonymous
  • anonymous
Get x by itself
terenzreignz
  • terenzreignz
And then you'll have reduced it to a linear equation in one variable. Solve for x, and you're almost done! Just substitute that x which you get for the x in either one of the equations you started with, and then solve for y, and then you'll be done!
anonymous
  • anonymous
oh my....I appreciate your efforts!!
terenzreignz
  • terenzreignz
I appreciate your appreciation; have fun! :)
anonymous
  • anonymous
I will never have fun with math, but thank you:)

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