2 - b.
3 - a.
I'm not sure about 4. Hope this helps!
Answer:

Step-by-step explanation:
Recall the formula:

We apply this formula to simplify 
This implies that:



This simplifies to


Its the second one
Point slope formula is:
Y - (y1) = m ( x - (x1) )
M is the slope so -5/7
( 6 is (x1) , 2 is (y1) )
Y-2=-5/7(x-6)
Answer:
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