anonymous
  • anonymous
please help me solve using substitution method -2x + 0y = -14 x + 11y = 18
Mathematics
jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
x=7
anonymous
  • anonymous
Do I multiply the 'y' variables ? like 0y (11) and (0) 11y to zero it out?
anonymous
  • anonymous
yea.........

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anonymous
  • anonymous
but I got x = -2, what did I do wrong?
anonymous
  • anonymous
how did you get x = 7 pls?
anonymous
  • anonymous
& plug in the value of x in other equation so.that u can get value of "y".
anonymous
  • anonymous
thank you
anonymous
  • anonymous
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anonymous
  • anonymous
dont I have to add -14 + 18?
anonymous
  • anonymous
-2x + 0y = -14 x + 11y = 18 -2x = 4 x = -2
anonymous
  • anonymous
I'm confused
anonymous
  • anonymous
sorry
anonymous
  • anonymous
ohhh ok I got it, I was using the elimination method...so sorry
anonymous
  • anonymous
its ok :-)
anonymous
  • anonymous
the 2nd equation doesnt check out so I guess it is not a solution
anonymous
  • anonymous
jst putt value of x in 2nd equation & u'll get value of "y"...........ok
anonymous
  • anonymous
ok ty
radar
  • radar
First you decide which variable is to be substituted, x oy. In this case you can solve for x in the first equation alone: -2x + 0y=-14 obviously x=7 It means we now we have a value to substitute for x in the second equation x+11y = 18 substituting the value 7 for x we get 7+11y = 18 Now simply solve for y subtracting 7 from both sides getting: 11y=11 making y=1.

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