Respuesta :

dannybwoy640

Answer:

m = - 1/4

Step-by-step explanation:

When two line is perpendicular to each other the product of them is - 1

So let the other line be B

Gradient of B = t

Gradient of A = 4

[tex]t \times 4 = - 1 \\ t = - \frac{1}{4} [/tex]

therefore m = - 1/4