a) 3x+4=3*(-2)+4=-6+4=-2
b) -8-2y=-8-2*3=-8-6=-14
c) 2x+3y-6=2*4+3*(-3)-6=8-9-6=-7
d)1/5a(a-2)=1/5*10(10-2)=2*8=16
licze na naj;))
