Question

equação do 1 grau A (2,1) B (-3,-1)

Answer 1

(x , y) → y = ax + b

$\mathsf{\begin{cases}1 = 2a +b \\-1 = -3a +b \\\end{cases}}$

(I) -(II)

1 -(-1) = 2a -(-3a)

2 = 5a

2/5 = a

b = 1 -4/5

b = 1/5

y = 2x/5 +1/5 ⇔ y = (2x + 1)/5