anonymous
  • anonymous
10x+7y= 49 10y-x=70 use either elimination or substitution
Mathematics
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SOLVED
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chestercat
  • chestercat
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anonymous
  • anonymous
@ganeshie8
ganeshie8
  • ganeshie8
u familiar wid substitution method... ?
anonymous
  • anonymous
idk this is a review from algebra I, im in geometry, so i don't remember how to do algebra stuff

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ganeshie8
  • ganeshie8
its okay :) its simple, il walk you through
anonymous
  • anonymous
ok thanks
ganeshie8
  • ganeshie8
Given equations : 10x+7y= 49 ------(1) 10y-x=70 --------(2)
ganeshie8
  • ganeshie8
from (2), 10y-x=70 x = 10y - 70, substitute this x value in (1)
ganeshie8
  • ganeshie8
10x+7y= 49 10(10y-70) + 7y = 49 100y - 700 + 7y = 49 107y = 749 y = ?
anonymous
  • anonymous
7. ok thanks!
ganeshie8
  • ganeshie8
y=7, you need to find x also
anonymous
  • anonymous
aw mann
anonymous
  • anonymous
so how
anonymous
  • anonymous
plug it in the 1st equation?
ganeshie8
  • ganeshie8
yes, looks you're back to algebra brilliance again :)
anonymous
  • anonymous
haha ok
anonymous
  • anonymous
i sitll have 11 more oh mygod!
anonymous
  • anonymous
i got 10x=0 so its no solution right?
anonymous
  • anonymous
yea it is, i remember my teacher saying that one is no solution
ganeshie8
  • ganeshie8
10x = 0 x = 0
ganeshie8
  • ganeshie8
so the solution of the system is, x = 0 y = 7
anonymous
  • anonymous
yup

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