Verified Answer :

slope = (10-1)/(1+2) = 9/3 = 3

y = mx + b
1 = 3(-2) +b
1 = -6 + b
b = 7

equation

y = 3x + 7  
or
3x - y = -7

answer is 3x − y = −7 (first choice)

The anser would be the first one  (3x - Y =  -7)

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