anonymous
  • anonymous
Write a system of equations for the following situation. Sharon has some $1 bills and some $5 bills. She has 14 bills which total to a value of $30.
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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Kuoministers
  • Kuoministers
let $1 = x and $5 = y ok? so 1x + 5y = 30 now that is one equation
anonymous
  • anonymous
right
Kuoministers
  • Kuoministers
any idea what the 2nd one is?

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anonymous
  • anonymous
14x+14y=30?
Kuoministers
  • Kuoministers
x + y = 14
Kuoministers
  • Kuoministers
now we use a method to find x and y? which do you like ^^ elimination? substitution?
anonymous
  • anonymous
the 1st one
Kuoministers
  • Kuoministers
awsome (so much easier) x + 5y = 30 x + y = 14 we subtract x from x vertically. 4y = 16
anonymous
  • anonymous
y=4
Kuoministers
  • Kuoministers
now i hope you can figure it out. once you find y sub y into the equation
anonymous
  • anonymous
isnt that for the substitution method?
Kuoministers
  • Kuoministers
nope
Kuoministers
  • Kuoministers
we use the elimination then we sub y into the equation
Kuoministers
  • Kuoministers
if we did substitution we would make y the subject then get y THEN we would sub y into equation to get x
anonymous
  • anonymous
which equation should i plug the 4 in for y?
Kuoministers
  • Kuoministers
any :)
Kuoministers
  • Kuoministers
x + y = 14 would just be easier though
anonymous
  • anonymous
ok ill go for that. I got 10 for x
Kuoministers
  • Kuoministers
good so we can conclude x = 10 and y = 4
anonymous
  • anonymous
srry i didn't get the 2nd equation when u asked :(
Kuoministers
  • Kuoministers
mhm what equation?
Kuoministers
  • Kuoministers
x + y = 14?
anonymous
  • anonymous
yea
Kuoministers
  • Kuoministers
well there is some $1 and $5 bills yea... and they add to 14. we said that $1 is x and $5 is y. so x + y is equal to 14.
anonymous
  • anonymous
ok
Kuoministers
  • Kuoministers
thank you!!

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