fungsi h(x) = -3x+7 mempunyai h(a)=4 dan h(5)= b.nilai a-b adalah..

h(x) = -3x + 7

h(a) = 4
-3a + 7 = 4
-3a = 4 - 7
-3a = -3
a = -3/-3
a = 1

h(5) = a
-3(5) + 7 = a
-15 + 7 = a
-8 = a
a = -8

a - b = -8 - 1 = -9