Diketahui f (x) = px + q jika f (1) = -8 dan f ( -3 ) = 12, nilai f ( -3) adalah.... #mksh Pake cara

f(x) = px + q
f(1) = p(1) + q = - 8
f(-3) = p(-3) + q = 12
..
p + q = - 8
- 3p + q = 12
---------------- --
4p = - 20
p = - 20/4
p = - 5

p + q = - 8
-5 + q = - 8
q = - 8 + 5
q = - 3

f(x) = px + q = - 5x - 3

f(-3) = - 5(-3) - 3
= 15 -3
= 12

f(x) = px + q
 f(1) = p + q = -8
f(-3) = -3p + q = 12
------------------------- -
                  4p = -20
                    p = -20/4
                    p = -5

p + q = -8
-5 + q = -8
       q = -8 + 5
       q = -3

 f(x) = px + q
f(-3) = -5(-3) + (-3)
        = 15 + (-3)
        = 12