suatu fungsi memiliki rumus f(x) = ax + b dengan nilai f(-2)= -1 dan f(1) = 11. nilai 5a + b = sama caranya ya,hehe

f(x) = ax + b
f(-2) = a (-2) + b = -1
-2a + b = -1

f(1) = a (1) + b = 11
a + b = 11

》-2a + b = -1
a + b = 11
---------------------- -
-3a = -12
a = 12/3
a = 4
》-2a + b = -1
-2 (4) + b = -1
-8 + b = -1
b = -1 + 8
b = 7
》5a + b
5 (4) + 7
20 + 7 = 27