Question

Плиз дам 20 баловпжпжжпжпжпжпжпж

Answer 1

$(14y+21)*(1,8-0,3y)=0\\(14y+21)*(\frac{9}{5}-\frac{3}{10}y)=0\\14y+21=0;\frac{9}{5}-\frac{3}{10}y=0\\y_{1}=-\frac{3}{2};y_{2}=6$