Use the ordered pairs to first find the slope then substitution into y=mx+b to find b
Answer:
1
Step-by-step explanation:

The answer is 6 units and 3 fourths
5 ( x + 3) = 6x - 3
5x + 15 = 6x - 3
x = 18 <====== this is the number
The answer would be 18mm because 6+6+3+3 considering that there are 4 sides.