sloppycanada
  • sloppycanada
Is there a difference between solving an equation using the elimination method instead of the substitution method? really bad at the substitution method, much rather use the elimination.
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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Jack1
  • Jack1
no, no difference in answers, just difference in the approach, s'all
UsukiDoll
  • UsukiDoll
elimination method takes out a variable (x or y) and then you can just solve (for x or y) meanwhile substitution means x or y has to be something and then it gets plugged back into the first or second equation... combine like terms solve for x or y lalalalal but both procedures should produce the same results.
sloppycanada
  • sloppycanada
Oh okay, so if I solve this question - Solve 4x + 3y = 13 by the substitution method. x + y = 4 using substitution I'll get the same answer?

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UsukiDoll
  • UsukiDoll
you should get the same answer.
UsukiDoll
  • UsukiDoll
trying to think what would be easier.. ah take the second equation and have either x or y by itself
UsukiDoll
  • UsukiDoll
take x+y = 4 and rearrange it having either x = ? or y = ?
Jack1
  • Jack1
4x + 4y = 16 4x = 16 - 4y 4x = 13 - 3y 16 - 4y = 13 - 3y is this elimination or am i doing it wrong again?
UsukiDoll
  • UsukiDoll
o_O
UsukiDoll
  • UsukiDoll
ok I'll give an example where elimination can be used x+y=2 x-y=5 now use elimination method @Jack1
Jack1
  • Jack1
dont give me that look
Jack1
  • Jack1
;P
Jack1
  • Jack1
2-y = 5+y ...? im serious, i dont remember this properly hey
sloppycanada
  • sloppycanada
So for this I got x = 1 and y = 3
Jack1
  • Jack1
then solve for y, yeah?
UsukiDoll
  • UsukiDoll
for my example x+y=2 x-y=5 add the two equations together @Jack1
UsukiDoll
  • UsukiDoll
@sloppycanada that's right when you plug in x =1 and y=3 your equations will be true!
UsukiDoll
  • UsukiDoll
4x + 3y = 13 x + y = 4 since x = 1 and y =3 4(1)+3(3) =13 4+9=13 13=13 Similarly 1+3=4 4=4
Jack1
  • Jack1
right, now i remember, cheers @UsukiDoll
sloppycanada
  • sloppycanada
Alright so point is - I don't need to use the sub method when it says too.
sloppycanada
  • sloppycanada
thanks!

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