anonymous
  • anonymous
5x+4y=3 2x+6y=30 find the value of y in the solution
Algebra
chestercat
  • chestercat
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Astrophysics
  • Astrophysics
Any specific method?
Astrophysics
  • Astrophysics
I usually enjoy using substitution method, so you can take one of the equations isolate x and plug it in for x in the second variable. So |dw:1436097947141:dw|
Astrophysics
  • Astrophysics
Now we plug that in for x in the second equation |dw:1436098000135:dw| solve for y.

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UsukiDoll
  • UsukiDoll
while substitution method can be used, it creates fractions and could be harder to solve for y. The elimination method can get to solving y faster we are given these equations 5x+4y=3 2x+6y=30 multiply the entire first equation by -2 and multiply the entire second equation by 5 After that.. add them together and solve for y
UsukiDoll
  • UsukiDoll
sorry I forgot... if we add these 2 equations together (after what I mentioned) the x variable should disappear.
anonymous
  • anonymous
5x+4y=3 5x = 3 - 4y x = (3-4y)/5 put in 2nd eqyation: 2x+6y=30 2(3-4y)/5 +6y = 30 6-8y+30y = 150 22y = 144 y = 72/11
anonymous
  • anonymous
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anonymous
  • anonymous
I don't think you need my help here :)

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