Resposta :
a.1 + b = 2
a.2 + b = 7
a + b = 2(-1)
2a + b = 7
- a - b = - 2
2a + b = 7
a = 5
a + b = 2
5 + b = 2
b = 2 -5 ==> b = - 3
F(x) = 5x - 3
a.2 + b = 7
a + b = 2(-1)
2a + b = 7
- a - b = - 2
2a + b = 7
a = 5
a + b = 2
5 + b = 2
b = 2 -5 ==> b = - 3
F(x) = 5x - 3