no 2 yang III tolonggggggggggggggggg

a. f(x) = px + q
f(-2) = 13 => -2p + q = 13
f(3) = 7 => 3p + q = -7
_________-
-5p = 20
p = -4
3.-4 + q = -7
q = -7 + 12 = 5

b. rumus fungsinya => f(x) = -4x + 5
c. f(5) = -4.5 + 5 = -20 + 5 = -15