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OpenStudy (anonymous):
use elimination method to solve: a + 9b = 19 a + 2b = -2
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OpenStudy (anonymous):
a + 9b = 19 (-1)(a + 2b = -2) a + 9b = 19 -a - 2b = 2 Cross out the positive "a" and the negative "a" 7b = 21 b = 3 Then plug 3 in for "b" for one of the equations. a + 9(3) = 19 a + 27 = 19 -27 -27 a = -8
OpenStudy (anonymous):
thank u!
OpenStudy (anonymous):
No problem
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