Question

calcule x-y a)x=6 e y y=+5 b)x=-7 e y=+8 c)x=-9 e y=-5 d) x=+2 e y=15

Answer 1

a) 6-(+5)=6-5=1
b) -7-(+8)=-7-8=-15
c)-9-(-5)=-9+5=-4
d)2-(+15)=2-15=-13