Question

решите систему уравнений

Answer 1

$left { { frac{x+y}{2} -frac{2y}{3} = frac{5}{2} } atop { frac{3x}{2}+2y =0}} right. left { {{3x+3y-4y=15} atop {3x+4y=0}} right. left { {{-y+3x=15} atop {3x+4y=0}} right. left { {{y=3x-15} atop {3x+4y=0}} right. 3x+4(3x-15)=0 3x+12x-60=0 15x=60 x=4 y=3*4-15 = -3$