Answer:
Explanation:
Use this formula: 
y - y1 = m ( x - x1 ) 
We are told m = -3 and given the point (12 , 5) ---- > so x1 = 12 and y1= 5 
Put these values into the formula above and you get: 
y - y1 = m ( x - x1 ) 
y - 5 = -3 ( x - 12 ) 
y - 5 = -3x + 36 
y = -3x + 36 + 5 
y = -3x + 41