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OpenStudy (anonymous):
if using substitution method how do i solve -4x+y=6, -5x+y=21
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jimthompson5910 (jim_thompson5910):
Isolate y in the first equation -4x+y=6 -4x+y=6 -4x+y+4x=6+4x y = 4x + 6
jimthompson5910 (jim_thompson5910):
Then plug that into the second equation -5x+y=21 -5x+( y )=21 -5x+( 4x+6 )=21 -5x + 4x + 6 = 21 I'll let you finish up
OpenStudy (anonymous):
ok thank you
jimthompson5910 (jim_thompson5910):
you're welcome
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