Hai teman-teman yang hatinya baik tulus suka membantu orang tolong aku nih please please banget makasih

a. f : ax+b
f(-1) = 1
f(2) =7

f(-1) = a(-1) + b = 1
-a +b = 1
-a = 1 - b
a = -1 + b

f(2) = a(2) + b = 7
2a + b = 7

menentukan b

2a + b = 7
2(-1 + b) + b = 7
-2 + 2b + b = 7
3b = 7 + 2
3b = 9
b = 9/3
b = 3

menentukan a

a = -1 + b
a = -1 + 3
a = 2

b. f(x)= a(x)+b

c. f(5) = a(5)+b
= 2.5 + 3
= 13

f(-3) = a(-3) + b
= 2.-3 + 3
= -3