Hi

Using the point-slope formula, 

line 1 passes through

(-3,-7) and 

(-7,-5)   m = -2/4 = -1/2     | y = (-1/2)x -17/2

line 2 passes through

(-5,-2) and 

(-7,-6)  m =  4/2 = 2         | y = 2x + 8   

 Lines are perpendicular to one another as: -1/2*2 = -1



 

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