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Dthompson
Dthompson Dthompson
  • 22-01-2015
  • Mathematics
Answered

9x+10y=14

7x+5y=-3

Any method!

THX!!!

Verified Answer :

naǫ
naǫ naǫ
  • 22-01-2015

\(9x+10y=14 \\ 7x+5y=-3 \ \ \ |\times (-2) \\ \\ 9x+10y=14 \\ \underline{-14x-10y=6} \\ 9x-14x=14+6 \\ -5x=20 \\ x=\frac{20}{-5} \\ x=-4 \\ \\ 9x+10y=14 \\ 9 \times (-4)+10y=14 \\ -36+10y=14 \\ 10y=14+36 \\ 10y=50 \\ y=5 \\ \\ (x,y)=(-4,5)\)

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