Question

Помогите пожалуйста! (№4 и 5)

Answer 1

4)
$left { {{3x textgreater 1} atop {-x textless 3}} right. , left { {{x textgreater 1/3} atop {x textgreater -3}} right. , x textgreater 1/3$

5)
$left { {{x^2-9y^2=150} atop {x+3y=50}} right. , left { {{(x-3y)(x+3y)=150} atop {x+3y=50}} right. , left { {{50(x-3y)=150} atop {x+3y=50}} right. , left { {{x-3y=3} atop {x+3y=50}} right. ,2x=53,\x=26.5\y=frac{50-53/2}{3}=frac{47/2}{3}=frac{47}{6}\\(frac{53}{2}, frac{47}{6})$