Question

Решите систему уравнений, СРОЧНО!!!

9x-10y=3
2x-3y=6

Answer 1

$left { {{9x-10y=3} atop {2x-3y=6}} right. left { {{9x-10y=3} atop {2x=6+3y}} right. left { {{9x-10y=3} atop {x= frac{6+3y}{2} }} right. \ \ 9* frac{6+3y}{2}-10y=3 |*2 \ \ 9(6+3y)-20y=6 \ 54+27y-20y=6 \ 7y=-48 \y=- frac{48}{7} =-6 frac{6}{7} \ \ x= frac{6+3y}{2} = frac{6+3*(- frac{48}{7}) }{2} = frac{6- frac{144}{7} }{2} =3- frac{72}{7} = frac{21-72}{7} =- frac{51}{7} =-7 frac{2}{7} \ \ OTBET: (-7 frac{2}{7};-6 frac{6}{7} )$

Answer 2

Спасибо огромное!!!