Answer:
1st blank: 1
2nd blank: -3
Step-by-step explanation:
[tex]Y_{2} - Y_{1} / X_{2} - X_{1}[/tex]
1 - 2 / 4 - 5
-1/-1
slope = 1
1 = 4 + b
-3 = b
2 = 5 + b
hope this helps :)