iYuko
  • iYuko
Need help with Algebra 1
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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pogo
  • pogo
okay
iYuko
  • iYuko
(a) Solve the system of equations using the method of your choice. SHOW ALL WORK. (B) Explain why you chose that method a+c=9 8a+4.5c=58
pogo
  • pogo
what did you do?

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More answers

iYuko
  • iYuko
We can use the substitution method.
pogo
  • pogo
yeah you can do that
iYuko
  • iYuko
What is the first step?
pogo
  • pogo
our 1st equation is this-> a+c=9 so subtract c from both sides a+c-c=9-c a=9-c now you have this-> a=9-c just put this value of a in the 2nd equation :) then try to solve
iYuko
  • iYuko
so in the second equation will look like : 8(9-c)+4.5c=58
josedavid
  • josedavid
u are in 9 grade and in flvs
pogo
  • pogo
no hes not neither am i
iYuko
  • iYuko
8(9-c)+4.5c=58 8(9-c)+4.5/10c=58 \[8(-c+9)+\frac{ 3^{2} *5}{ 2*5 }\]
iYuko
  • iYuko
c=4?
pogo
  • pogo
yeah
pogo
  • pogo
now use this- a=9-c
pogo
  • pogo
to get a
iYuko
  • iYuko
im so confused
iYuko
  • iYuko
lets start over
pogo
  • pogo
no wait
pogo
  • pogo
do you understand how we get c?
iYuko
  • iYuko
kind of
iYuko
  • iYuko
when i sub it in for a then I got c?
iYuko
  • iYuko
9-c
pogo
  • pogo
okay we just wanted to get rid of "a" from the 2nd equation so we substituted the value of a as (9-c) which we got from the 1st equation now after we did the substitution in the 2nd equation we solved it to get c now we have c we just put the value of c in our 1st equation to get the value of a
iYuko
  • iYuko
Did i solve for c correctly?
pogo
  • pogo
well your answer is correct c is 4 but i didn't get your method it looks messed up
iYuko
  • iYuko
okay so how do I do it correctly?
iYuko
  • iYuko
\[8(-c+9)+\frac{ 3^{2}*5 }{ 2*5 }c=58\]
iYuko
  • iYuko
I just simplify that to get c=4
pogo
  • pogo
oh okay :) well you can see it all explained here-http://www.cymath.com/answer.php?q=8(9-c)%2B4.5c%3D58
iYuko
  • iYuko
Okay we have c=4 now we need a which im guessing is a=5
pogo
  • pogo
yeah thats correct
iYuko
  • iYuko
but how do we solve for a?
iYuko
  • iYuko
sub in c?
pogo
  • pogo
yeah
iYuko
  • iYuko
a+c=9 a+4=9 a=5
pogo
  • pogo
correct
iYuko
  • iYuko
Thank you pogo
pogo
  • pogo
:D npo prbl yuko
pogo
  • pogo
*np
iYuko
  • iYuko
was this substitution method?
pogo
  • pogo
yes it was substitution method :)

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