Answer:
y = -3x - 25
Step-by-step explanation:
Find the slope:
m = ( -4 - 5 ) / ( 13 - 10 )
m = -9 / 3 = -3
pick one point and substitute it in the standard equation
y - y1 = m ( x - x1 )
y - 5 = -3 ( x - 10 )
y - 5 = -3x - 30
y = -3x - 25
m = -3, b = -25
