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OpenStudy (anonymous):
how do i rearrange these equations to make them easier for me to solve? a+s+t=90 s+t=a+20 9a+5s+2t=515
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hartnn (hartnn):
you can plug in s+t = a+20 from 2nd equation directly into the 1st equation to get an equation only in 'a'
hartnn (hartnn):
can you plug that in ?
OpenStudy (anonymous):
yes i get a+t=110 correct?
hartnn (hartnn):
how could you get 't' also ? can you show your work ?
OpenStudy (anonymous):
yes hold on
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OpenStudy (anonymous):
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