diketahui rumus fungsi f(x) = ax+b. jika f(3) = 15, f(-2) = 2)10, tentukan nilai a & b, rumus fungsi f(x) dan nilai f(7)

Ralat:
3a + b = 15
-2a + b = 10
__________-
5a = 5
a = 1

f(3) = 1(3) + b = 15
f(3) = 12
atau
f(-2) = 1(-2) + b = 10
f(-2) = 12


f(7) = ax + b
f(7) = 1(7) + 12
f(7) = 19

Yg tadi salah. Pakai yg ini aja