заранее извини там без рисунков но воть))
№1
1) 0,5y > -4
y>8
2) -4x >= -1
x>= 1/4
3) 64-6y >= 1-y
5y <= 63</strong>
y <= 63/5</strong>
4) 0,2x-2 < 7-0,8x
x < 9
№2
1) 
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2)
3)
2x+2} \atop {81+11x\geq 1+x}} \right. \\\\\left \{ {{-75x > - 100 } \atop {10x\geq -80\\}} \right. \\\\\left \{ {{x< 100/75} \atop {x\geq -8}} \right." alt="\left \{ {{102-73x > 2x+2} \atop {81+11x\geq 1+x}} \right. \\\\\left \{ {{-75x > - 100 } \atop {10x\geq -80\\}} \right. \\\\\left \{ {{x< 100/75} \atop {x\geq -8}} \right." align="absmiddle" class="latex-formula">
№3
