Question

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Answer 1

Sorry:

y - 1 = 3(x + 2)

y = 3x + 7

Answer 2

Yes you are right @Calculative

Answer 3

your y intercept is wrong. you can find where x=0 by using the slope formula. y2-y1/x2-x1=m with that point (-2,1) and (0,b) so b-1/(0-(-2)=3 so b-1=6 so b=7
y=mx+b
y=3x+7
but both ways work

Answer 4

i didnt fix my first part haha
your b intercept wasnt wrong i meant