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Dollar
Dollar asked in Science & MathematicsMathematics · 8 years ago

Please help me with this MATH question!?

If you solve the linear system

13x+11y+9z=161

9y−2z=76

−9z=18

then in the unique solution x=

Options:

a) 8

b) 9

c) 7

d) -2

1 Answer

Relevance
  • Mariam Kochalidze
    8 years ago
    Favorite Answer

    Now find y, we know that z is -2 so 9y-2x(-2)=76 then 9y+4=76 then 9y=72 y=8 then 13x+11x8+9x(-2)=161 then 13x+88-18=161 then 13x+70=161 then 13x=91 x=7

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