suatu fungsi dirumuskan F (×)= a×+b, jika F(-2)= 13 & F (3)= -7, maka nilai F (2) + F (-3)?

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f(x) = ax + b
f(-2) = - 2a + b = 13 ........(1)
f(3) = 3a + b = - 7 .........(2)
____________________ _
- 5a = 20
a = - 4

3a + b = - 7
3(-4) + b = - 7
- 12 + b = - 7
b = - 7 + 12
b = 5

rumus fungsi
f(x) = ax + b
f(x) = - 4x + 5

nilai f(2)
f(x) = - 4x + 5
f(2) = - 4(2) + 5
f(2) = - 8 + 5
f(2) = - 3

nilai f(-3)
f(x) = - 4x + 5
f(-3) = - 4(-3) + 5
f(-3) = 12 + 5
f(-3) = 17

nilai f(2) + f(-3)
= - 3 + 17
= 14