Answer:
3/4
Step-by-step explanation:
You can calculate slope with 
2 points from the graph are (0,-1) and (4,2)
plugging the points in would give you

Please rate me as brainliest if this helped!
Answer:
c
Step-by-step explanation:
Answer:
y=5x + 21
Step-by-step explanation:
y=5x×b
6= -15+b
b=21