Question

if(-3,12), (7,6), (x,9) all lie on same plane find value of x​

Answer 1

Explanation:

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Answer 2

Answer:

x=1/2

Step-by-step explanation:

points (-3,12), (7,6), (x,9) are co-linear.

Then,

1/2[x₁(y₂-y₃)+x₂(y₃-y₁)+x₃(y₁-y₂)]=0

or  x₁(y₂-y₃)+x₂(y₃-y₁)+x₃(y₁-y₂)=0

or  -3(6-9)+7(9-12)+x(12-6)=0

or  (-3*-3)+(7*-3)+6x=0

or  9-12+6x=0

or  6x-3=0

or  6x=3

or  x=3/6

or  x=1/2