Di ketahui fungsi dirumuskan dengan f(x) = ax + b. Jika f(2) = 13 dan f(5) = 22, maka nilai f(-2) adalah …

langsung aja y

f(2) = 2a + b = 13
f(5) = 5a + b = 22
_____________-
-3a = -9
a = 3

2a + b = 13
b = 13 - 2(3)
b = 13 - 6
b = 7

f(x) = ax + b
f(x) = 3x + 7
f(-2) = 3(-2) + 7
f(-2) = -6 + 7
f(-2) = 1

semoga berguna +_+

f(x) = ax + b
f(2) = 2a + b = 13
f(5) = 5a + b = 22
________________ -
         -3a = -9
            a = 3

2a + b = 13
2(3) + b = 13
b = 7

f(x) = ax + b
f(-2) = 3(-2) + 7
       = 1