anonymous
  • anonymous
slove equations and put it into a matrices 4t-5r=21 3t-7r=18
Mathematics
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anonymous
  • anonymous
slove equations and put it into a matrices 4t-5r=21 3t-7r=18
Mathematics
chestercat
  • chestercat
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
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lilg132
  • lilg132
4t - 5r = 21 (multiply all by 7) 3t - 7r = 18 (multiply all by -5) 28t - 35r = 147 -15t + 35r = 90 add the two equations together 13t =237 t = 18.230769230769230769230769230769 4(18.230769230769230769230769230769) - 5r = 21 72.923076923076923076923076923077 - 5r = 21 72.923076923076923076923076923077 - 21 = 5r 51.923076923076923076923076923077 = 5r 10.384615384615384615384615384615 = r not sure if this is right
anonymous
  • anonymous
i got the answer of t=57/13 and r=-9/13 but i have to put it into a matrices
lilg132
  • lilg132
lol damn i had it right the first time

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lilg132
  • lilg132
let me write it out again
anonymous
  • anonymous
ok but i dont know how to put it into a matrix
lilg132
  • lilg132
4t - 5r = 21 3t - 7r = 18 4t = 21 + 5r divide everything by 4 t = 5.25 + 1.25r 3(5.25 + 1.25r) - 7r = 18 15.75 + 3.75r - 7r = 18 15.75 - 18 = 7r - 3.75r -2.25 = 3.25r -2.25 / 3.25 = 3.25r / 3.25 -9/13 = r 4t - 5(-9/13) = 21 4t + 45/13 = 21 4t = 21 - 45/13 4t = 228/13 4t / 4 = (228/13)/4 t = 57/13
lilg132
  • lilg132
ok let me work out how to put into matrix
anonymous
  • anonymous
ok i got all that i just dont no how to make a matrix out of that
lilg132
  • lilg132
no idea with matrixes going to have to ask someone else sorry
lilg132
  • lilg132
im out of here bye
AriPotta
  • AriPotta
|dw:1354243922660:dw|
anonymous
  • anonymous
|dw:1354244060647:dw|
anonymous
  • anonymous
thats what i have to put my answer in
AriPotta
  • AriPotta
only two sets of brackets?
anonymous
  • anonymous
yes
AriPotta
  • AriPotta
are they only looking for Dt and Dr?
anonymous
  • anonymous
yes
AriPotta
  • AriPotta
|dw:1354244183257:dw| there. lol
anonymous
  • anonymous
lol
anonymous
  • anonymous
ok i got another problem for ya
AriPotta
  • AriPotta
mer.
anonymous
  • anonymous
3x-z=4 x+y+7z=0 3x+y-z=4 and x=148/119 y=16/17 z=1
anonymous
  • anonymous
that also has to be into a matrices
AriPotta
  • AriPotta
oh. idk about 3 variable ones. i'm sorry :/
anonymous
  • anonymous
ok thanks

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