anonymous
  • anonymous
Solve the following system of equations. 2x – 3y + z = –1 2x – 2y – 2z = –8 x + 5y – 3z = 2
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
ok lets do this
anonymous
  • anonymous
first of all we want to eliminate a value
anonymous
  • anonymous
so you choose 2 of the equations and eliminate z

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More answers

anonymous
  • anonymous
(2x-3y+z)2 2x-2y-2z
anonymous
  • anonymous
4x-6y+2z 2x-2y-2z
anonymous
  • anonymous
Okay, and then what do you do?
anonymous
  • anonymous
sec i gorgot the consonate
anonymous
  • anonymous
4x-6y+2x=-2 2x-2y-2z= -8
anonymous
  • anonymous
6x-8y=-10
anonymous
  • anonymous
2x – 3y + z = –1 2x – 2y – 2z = –8 x + 5y – 3z = 2
anonymous
  • anonymous
so now you take the equation we didnt use and eliminate z
anonymous
  • anonymous
x+5y-3z = 2 (2x-3y+z=-1)3
anonymous
  • anonymous
x+5y-3z=2 6x-9y+3z=-3
anonymous
  • anonymous
7x-4y=-3
anonymous
  • anonymous
7x-4y=-3 6x-8y=-10
anonymous
  • anonymous
any questions so far?
anonymous
  • anonymous
those are the 2 values we get after eliminating the z from equations
anonymous
  • anonymous
so we can solve for x and y now
anonymous
  • anonymous
(7x-4y=-3)2 6x-8y=-10
anonymous
  • anonymous
-2 oops
anonymous
  • anonymous
thank you soo much! i think i understand this a lot better now
anonymous
  • anonymous
-14x+8y=6 6x-8y=-10
anonymous
  • anonymous
-8x=-16
anonymous
  • anonymous
x=2
anonymous
  • anonymous
(7x-4y=-3)6 (6x-8y=-10)-7
anonymous
  • anonymous
42x-24y=-18 -42x+56y=-70
anonymous
  • anonymous
opps that +70
anonymous
  • anonymous
32y=52
anonymous
  • anonymous
y=52/32
anonymous
  • anonymous
y=13/8
anonymous
  • anonymous
so lets check our y value
anonymous
  • anonymous
6x-8y=-10
anonymous
  • anonymous
plug in x
anonymous
  • anonymous
6(2)-8y=-10

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