Question

помогите пожалуйста по математике ​

Answer 1

Ответ:

$1)left { {{0,2x+15y=9,8} atop {0,75x-10y=-3}} right.\left { {{0,2x+15y=9,8} atop {x=-4+frac{40}{3} y}} right.\0,2(-4+frac{40}{3}y)+15y=9,8\y=frac{3}{5} \x=-4+frac{40}{3}*frac{3}{5}\ x=4\(x,y)=(4,frac{3}{5} )\left { {{0,2*4+15*frac{3}{5}=9,8 } atop {0,75*4-10*frac{3}{5}=-3 }} right.\left { {{frac{49}{5}=frac{49}{5} } atop {-3=-3}} right. \(x,y)=(4,frac{3}{5} )$

$2)left { {{0,3x-0,5y=0\} atop {0,1x+2y=6,5}} right.\left { {{x=y*frac{5}{3} } atop {0,1x+2y=6,5}} right. \0,1y*frac{5}{3}+2y=6,5\y=3\x=3*frac{5}{3} \x=5\(x,y)=(5,3)\left { {{0,3*5-0,5*3=0} atop {0,1*5+2*3=6,5}} right. \left { {{0=0} atop {frac{13}{2}= }} right.frac{13}{2} \(x,y)=(5,3)$