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cupoosta [38]
3 years ago
8

Como Determinar a equação da reta que passa pelos pontos A(-1, -2) e B(5,2)

Mathematics
1 answer:
Komok [63]3 years ago
8 0

Answer:

A equação da reta é dada por: y = \frac{2}{3}x - \frac{4}{3}

Step-by-step explanation:

Equação de uma reta:

A equação de uma reta tem o seguinte formato:

y = ax + b

Em que a é o coeficiente angular e b é o coeficiente linear.

Coeficiente angular:

Com posse de dois pontos, o coeficiente angular é dado pela mudança em y dividida pela mudança em x.

A(-1, -2) e B(5,2)

Mudança em y: 2 - (-2) = 2 + 2 = 4

Mudança em x: 5 - (-1) = 5 + 1 = 6

Coeficiente angular: m = \frac{4}{6} = \frac{2}{3}

Então:

y = \frac{2}{3}x + b

Coeficiente linear:

Substituindo um ponto na equação, encontra-se o coeficiente linear.

B(5,2)

Quando x = 5, y = 2. Então:

y = \frac{2}{3}x + b

2 = \frac{2}{3}5 + b

b = 2 - \frac{10}{3} = \frac{6}{3} - \frac{10}{3} = -\frac{4}{3}

Então:

y = \frac{2}{3}x - \frac{4}{3}

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