How do I find an equation for a line? I need questions: 3&4

Pls help, I need it ASAP!

This is what I have so far for..
Question A(Number 3):
2-(-1) and 4-1 which equals 3/3 so m=1

Question B: i don’t know
Question A:(Number 4): (-3)-1 and 0-3 which equals 2/3 so m=0.6667
Help at least with how to find an equation for a line

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step-by-step explanation:

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the answer is a.

step-by-step explanation:

in three games of golf, alex shot two under par four times.