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10x+15>2x-6+x
10x-2x-x>-6-15
7x>-21
x>-3.
x∈(-3, +∞), narysuj wykres
b)7y-2(y-4)≥ 6- (2-y)
7y-2y+8≥6-2+y
4y≥-10
y≥-2,5
x∈<-2,5; +∞) narysuj wykres.
c)-2/3y -(2-3y)<5y+2(1-y)
-2/3-2+3y<5y+2-2y
3y-5y+2y<2/3+2+2
0<... <- sprzeczność.