anonymous
  • anonymous
Solve the following system of equations. Round your answers to the nearest tenth. Your answer will be in the form: (M,N). Find M + N, rounded to the nearest tenth. 5x+2y=21 -2x+6y=-34
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
A) 5x + 2y = 21 B) -2x + 6y = -34 2xA = ? 5xB = ?
anonymous
  • anonymous
say...
anonymous
  • anonymous
wait 2xA.... and 5xB?

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More answers

anonymous
  • anonymous
yes I meant this: \[2\times(5x+2y) = 2\times(21)\] and this: \[5\times(-2x+6y)= 5\times (-34)\]
anonymous
  • anonymous
okay let me try it
anonymous
  • anonymous
10x+4y=42 -10x+30y=-170 like that?
anonymous
  • anonymous
yes! :) and now find this: A + B = ?
anonymous
  • anonymous
D: okay
anonymous
  • anonymous
how am i going to erase the x variable when it is already a negative?!?! DDD:::
anonymous
  • anonymous
would it be 0x+34y=-128?
anonymous
  • anonymous
in this way: A + B = (10x-10x) + 34y = -128 -> 34y = -128
anonymous
  • anonymous
yes :)
anonymous
  • anonymous
so find y...
anonymous
  • anonymous
y=-3.76470588
hartnn
  • hartnn
just to give an alternate way: multiply A) by 3 and subtract the equations..
anonymous
  • anonymous
yes,@hartnn said...and you found y,so you can find x .. ;)
anonymous
  • anonymous
okay!!
hartnn
  • hartnn
so could you find x ?
anonymous
  • anonymous
5x+2(-3.765)=21 =5x+(-7.53)+7.52941176=21+7.53 =5x=28.53 =x=5.706
anonymous
  • anonymous
and the last part for (M,N) M+N So (5.706, -3.765) and M+N = 5.706+(-3.765)= 1.941 ~ 1.9
anonymous
  • anonymous
it is correct?
hartnn
  • hartnn
yes :D
anonymous
  • anonymous
:DDD yay!! thank you both
anonymous
  • anonymous
you're welcome madam...:)

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