Question 217289
g(y) = 7-2(y)
.
g(0) = 7 - 2(0)=7,,,,,subst  0  for  y
.
g(7/2) = 7-2(7/2) = 7-7=0,,,,subst (7/2)  for  y
.
g(s+2) =7-2(s+2) =7-2s-2(2) = 7-2s -4 = 3-2s ,,,,,subst (s+2)  for  y