fungsi f(x)=ax+b,jika f(2)=-2 dan f(-3)=13 maka nilai f(4) adalah...

f(x) = ax + b
f(-3) = 13 = -3a+b
f(2) = -2 = 2a + b
______________ -
15= -5a
a = -3

f(2) = -2 = 2(-3) + b
b = 4


f(4) = -3(4) + 4 = -8