Odpowiedź :
f(2) = 8, f(1) = 12
{2 * a + b = 8
{1 * a + b = 12
{2a + b = 8
{a + b = 12 / * (-1)
{2a + b = 8
+ {-a - b = -12
--------------------
a = -4
2 * (-4) + b = 8
-8 + b = 8
b = 8 + 8
b = 16
f(x) = -4x + 16
f(2) = 8, f(1) = 12
{2 * a + b = 8
{1 * a + b = 12
{2a + b = 8
{a + b = 12 / * (-1)
{2a + b = 8
+ {-a - b = -12
--------------------
a = -4
2 * (-4) + b = 8
-8 + b = 8
b = 8 + 8
b = 16
f(x) = -4x + 16