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OpenStudy (anonymous):
How do u solve this question using elimination m - n = -9 & 7m + 2n = 9? Please help me!!!
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OpenStudy (texaschic101):
m - n = -9 -->(2) 7m + 2n = 9 ----------------- 2m - 2n = -18 (result of multiplying by 2) 7m + 2n = 9 -----------------add 9m = -9 m = -1 now sub -1 in for m in either of the original equations m - n = -9 -1 - n = -9 -n = -9 + 1 -n = -8 n = 8 check... 7m + 2n = 9 7(-1) + 2(8) = 9 -7 + 16 = 9 9 = 9 (correct) m = -1 and n = 8 any questions ?
OpenStudy (anonymous):
No and thanx :)
OpenStudy (texaschic101):
YW :)
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