f(x)=-9x+5
Substitute for a a=-8
f(a)=-9•(-8)+5
f(a)=77
Substitute for b b=6
f(b)=-9•6+5
f(b)=-49
Substitute for f(a) and f(b) f(a)=77 f(b)=-49
A.) 77+(-49) = 77-49 = 28
B.) 77-(-49) = 77+49 = 126
Hope this helps!!
