malam, boleh minta bantuanya? thanks :)

maaf kalo gak jelas ;b

f(-3) = -3m + n = -7
f(2) = 2m + n = 13 (trus dikurangi)
-5m = -20
m = 4
substitusi m ke 2m + n = 13
2(4) + n = 13
8 + n = 13
n = 5

f(5) = 4(5) + 5
= 20 + 5 = 25 (ini jwbnnya)