tlng bantu jawab no 1,2,3,4

nomer 3
a) p-q+r=
-2-4+3= -6-4+6=-4

b) 3p-q+2r=
3(-2)-4+2(3)= -6-4+6=-4

c) 5p+2q-3r=
5(-2)+2(4)-3(3)= -10+8-9=-11