anonymous
  • anonymous
solve using the elimination method plz help!!! 5x+3y=-11 7x-2y=19
Mathematics
schrodinger
  • schrodinger
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anonymous
  • anonymous
Multiply the first equation by 2 and the second equation by 3. Then your y term will be eliminated and you can solve for x. Once you have x, you can plug that value back into either quation and solve for y.
anonymous
  • anonymous
i get stuck when i get to 5(31/16)+3y=-11
anonymous
  • anonymous
because i get that x=31/16

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anonymous
  • anonymous
2(5x + 3y = -11) 3(7x - 2y = 19) 10x + 6y = -22 21x - 6y = 57 31x = 35 x = 35/31
anonymous
  • anonymous
so when i plug it back in it doesnt make sence to me how to solve
anonymous
  • anonymous
ohhh
anonymous
  • anonymous
i was messing up with the mulitplicaiton!!!
anonymous
  • anonymous
5(35/31) + 3y = -11 175/31 + 3y = -11 3y =31(-11) - 175 ------- ---- 31 31 3y = 341 - 175 -------- 3 3y = 166 ---- 3 y = 166 1 --- x --- 3 3 y = 166/9
anonymous
  • anonymous
but it says the answer is (35/31,-172/31)
anonymous
  • anonymous
yup y=-172/31 .. just a little typing error in the above solution.
anonymous
  • anonymous
OOPS.. I'm sorry
anonymous
  • anonymous
3y = 31(-11) - 175 ------ ---- 31 31 3y = -341 - 175 --------- 31 3y = -516 ---- 31 3y = -516 1 ---- x -- 31 3 y = -516 ---- 93 y = -172 ----- 31

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