the coordinates of 3 points are a(-1, -6), b(3, -12) and c(k, 6). Find the value of k if a, b and c are collinear.

The value of is -9.

Step-by-step explanation:

If , and , then . By vectors sum, we find each vector below:

(1)

(2)

By substituting in the equation defined at the begining of this

(3)

The value of is:

(3a)

If we know that , then the value of is:

Then, the value of is -9.

d) by the cross product property, ab^2 = bc multiplied by ad

step-by-step explanation:

we are given

in the given triangle abc

angle a is 90° and segment ad is perpendicular to segment bc

we can see that

triangle(abc) and triangle(abd) are similar because they have common side and same angle (90 degree)

so, triangles(abc) and abd are similar

since, they are similar

so, the ratio of their sides must be equal

we get

now, we can cross multiply

and we get

so, this could be step to prove it

b mark me branliest thx

step-by-step explanation: