Question

Determine a equacao da reta : a) A(2,1) e b(5,4)

Answer 1

Oi

f(x) = ax + b

f(2) = 2a + b = 1
f(5) = 5a + b = 4

5a - 2a = 4 - 1
3a = 3
a = 1

2 + b = 1
b = -1

y = x - 1