mckenzieandjesus
  • mckenzieandjesus
Solve the system using elimination. 3x – y = 28 3x + y = 14
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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mckenzieandjesus
  • mckenzieandjesus
(8, –4) (–7, 7) (7, –7) (–4, 8)
Vocaloid
  • Vocaloid
hint: add the two equations together
Vocaloid
  • Vocaloid
start with the x's 3x + 3x = ?

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mckenzieandjesus
  • mckenzieandjesus
3+3=6 28+14=42
Vocaloid
  • Vocaloid
almost 3 + 3 = 6 3x + 3x = ___ fill in the blank
mckenzieandjesus
  • mckenzieandjesus
6x?
Vocaloid
  • Vocaloid
good! now go to the y's -y + y = ?
mckenzieandjesus
  • mckenzieandjesus
0?
Vocaloid
  • Vocaloid
good! now we have 6x = 42 x = ___ fill in the blank
mckenzieandjesus
  • mckenzieandjesus
do i add those together?
Vocaloid
  • Vocaloid
nope, just find x
Vocaloid
  • Vocaloid
6x = 42 what does x = ?
mckenzieandjesus
  • mckenzieandjesus
7
Vocaloid
  • Vocaloid
good! x = 7, so we look for the answer choice with an x-coordinate of 7 the only possibility is (7,-7)
mckenzieandjesus
  • mckenzieandjesus
yeah
mckenzieandjesus
  • mckenzieandjesus
can u help me with -5x+y=-5 -4x+2y=2
Vocaloid
  • Vocaloid
hint: multiply the first equation by 2 first
mckenzieandjesus
  • mckenzieandjesus
ok 10
Vocaloid
  • Vocaloid
nope -5x*2 = ?
mckenzieandjesus
  • mckenzieandjesus
-10?
Vocaloid
  • Vocaloid
don't forget the x
Vocaloid
  • Vocaloid
ok, the way I wrote it was a bit vague, but I meant (-5)*(2)*x = ?
mckenzieandjesus
  • mckenzieandjesus
-10x
mckenzieandjesus
  • mckenzieandjesus
what do I do next?
Vocaloid
  • Vocaloid
2*y = ?
mckenzieandjesus
  • mckenzieandjesus
whats y?
texaschic101
  • texaschic101
-5x + y = -5 ----multiply by -2 -4x + 2y = 2 ------------ 10x - 2y = 10 (result of multiplying by -2) -4x + 2y = 2 ------------add 6x = 12 -- divide by 6 on both sides x = 2 now sub 2 in for x in one of the original equations and find y. questions ?
mckenzieandjesus
  • mckenzieandjesus
-6?
mckenzieandjesus
  • mckenzieandjesus
-4*2+2=-6
texaschic101
  • texaschic101
-5x + y = -5 -5(2) + y = -5 -10 + y = -5 y = -5 + 10 y = 5 check... -4x + 2y = 2 -4(2) + 2(5) = 2 -8 + 10 = 2 2 = 2 (correct) so x = 2 and y = 5
mckenzieandjesus
  • mckenzieandjesus
someone told me 2,5 wasnt the right answer..
texaschic101
  • texaschic101
plug it into the original equations to check... -4x + 2y = 2 -5x + y = -5 -4(2) + 2(5) = 2 -5(2) + 5 = -5 -8 + 10 = 2 -10 + 5 = -5 2 = 2 (correct) 5 = 5 (correct) (2,5) is the solution because it checks out in both equations as correct
mckenzieandjesus
  • mckenzieandjesus
Thank You

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