Answer:
They are not co-linear.
Step-by-step explanation:
For three point's to be co linear the slopes of the lines connecting them should be same
Mathematically we can write for 
to be co-linear we should have
Applying the given values we obtain
As we can see the values are not equal thus the points are not co-linear.
Step-by-step explanation:
coefficients is 3
constants are 2 and 7
So for this you must ignore the student with 2.
then you see how many in order
1-6 siblings
1-5 siblings
2-3 siblings
add up the left coulumn to get 4 people have more than 3 siblings
Lets use bedmas/pemdas, and simplify the equation to find n.
n = 9 * 27 + 2 * 31 - 28
n = 243 + 2 * 31 - 28
n = 243 + 62 - 28
n = 305 - 28
n = 277
Therefore n = 277.
