Answer:

Step-by-step explanation:
To find out the m(slope) of the equation use the formula:
.
Substitute the values:

Combine the values:

Find the value of the fraction:

M is -3.
The equation so far is 
To find the y intercept, substitute one pair of coordinates into the equation and solve for b:
.
We see that b =-17 so the full equation would be:
.
Answer:
x<=-4
.............................................
164+56−(3+4+1)
=220−(3+4+1)
=220−(7+1)
=220−8
=212