fungsi H dinyatakan dengan rumus h(x) = ax + b.jika h(5)=15 dan h(4)=11,nilai h(-1) adalah....

h(x) = ax +b
h(5) = a(5) +b = 15
       = 5a +b = 15

h(x) = ax +b
h(4) = a(4) +b = 11
       = 4a +b = 11

5a +b = 15
4a +b = 11 -
      a = 4

5a +b = 15
5(4) +b = 15
20 +b = 15
b = 15 -20
b = -5

h(x) = ax +b
h(-1) = 4(-1) +(-5)
         = -4 +(-5)
         = -9