Question

Решить систему неравенств

Answer 1

a) $\displaystyle \left \{ {{3x+9 > 0|:3} \atop {x-5 < 1}} \right. < = > \left \{ {{x+3 > 0} \atop {x < 1+5}} \right. < = > \left \{ {{x > -3} \atop {x < 6}} \right. < = > -3 < x < 6$

b) $\displaystyle \left \{ {{2-y > 3} \atop {3y-1 < 2}} \right. < = > \left \{ {{-y > 3-2} \atop {3y < 2+1}} \right. < = > \left \{ {{-y > 1|:(-1)} \atop {3y < 3|:3}} \right. < = > \left \{ {{y < -1} \atop {y < 1}} \right. < = > y < -1$