diketahui f(x)=ax+B.jika f (-2)=-7,dan f (4)=23,maka fungsi F adalah..

f(-2) = -7
a(-2) + b = -7
-2a + b = -7
f(4) = 23
a(4) + b = 23
4a + b = 23
eliminasi
4a + b = 23
-2a + b = -7
----------------- _
6a = 30
a = 30/6 = 5
4(5) + b = 23
20 + b = 23
b = 23 - 20 = 3
f(x) = 5x + 3

f(x) = ax+b
f(-2)=-2a+b
f(4)= 4a+b

4a+b = 23
-2a+ b = -7
__________-
6a = 30
a= 5

f(-2)= -7
-2(5)+b = -7
-10+b = -7
b= 3

f(x) = 5x+3