mckenzieandjesus
  • mckenzieandjesus
solve the system using elimination. 5x + 8y = –29 7x – 2y = –67 (–7, 9) (-10, 21/8) (–9, 2) (–1, –3)
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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mckenzieandjesus
  • mckenzieandjesus
@jim_thompson5910
Mehek14
  • Mehek14
we can eliminate y
Mehek14
  • Mehek14
multiply everything in the second equation by 4

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mckenzieandjesus
  • mckenzieandjesus
7*4=28 2*4=8 right?
Mehek14
  • Mehek14
it's actually -2*4 = -8
mckenzieandjesus
  • mckenzieandjesus
do i multiply -67 too?
mckenzieandjesus
  • mckenzieandjesus
oops yeah
mckenzieandjesus
  • mckenzieandjesus
What do i do next?
Mehek14
  • Mehek14
yes you multiply -67 * 4
mckenzieandjesus
  • mckenzieandjesus
-268
Mehek14
  • Mehek14
so \(\bf{5x+8y=-29\\28x-8y=-268}\)
Mehek14
  • Mehek14
now add 5x +28x = 33x 8y + (-8y) = 0 -29 + (-268) = -279
mckenzieandjesus
  • mckenzieandjesus
ok
mckenzieandjesus
  • mckenzieandjesus
what do I do next?
Mehek14
  • Mehek14
-29 + (-268) = -297
Mehek14
  • Mehek14
so 33x = 297 solve for x
mckenzieandjesus
  • mckenzieandjesus
33*9=297 so x=9
Mehek14
  • Mehek14
yes
Mehek14
  • Mehek14
wait -297
Mehek14
  • Mehek14
so x = -9
mckenzieandjesus
  • mckenzieandjesus
oh ok
Mehek14
  • Mehek14
so (-9,2)
mckenzieandjesus
  • mckenzieandjesus
so its (-9, 2)
Mehek14
  • Mehek14
yup
mckenzieandjesus
  • mckenzieandjesus
thanku!!
Mehek14
  • Mehek14
yw :]
mckenzieandjesus
  • mckenzieandjesus
Would u know how to do this? What is the solution of the system of equations? y = –4x + 10 y = –2x – 6 (–2.67, 20.67) (–22, 8) (–2, –2) (8, –22)

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