tolong dibatu ya soalnya dikumpulkan sekarang

[tex]f(x) = ax + b \\ f( - 2) = a( - 2) + b \\ - 1 = - 2a + b \\ 2a - b \: = 1...(1)[/tex]
[tex]f(x) = ax + b \\ f(1) = a(1) + b \\ 11 = a + b \\ a + b = 11...(2)[/tex]
eliminasi (1) & (2)
2a-b = 1
a+b = 11
3a = 12
a = 4 sub ke (2)

a+b=11
b = 11-a
b = 11-4
b = 7

maka 5a + b = 5 (4) + 7 = 27