Answer:
y = 4/5 x - 2 1/5
Step-by-step explanation:
1. Find the slope:
1 - 5/ 4 - 9 = 4/5 = m
2. Find b by plugging in the m and one of the points given into y = mx + b
1 = 4/5 ( 4) + b
1 = 16/5 + b
-2 1/5 = b
3. Write the equation using the m and the b you just found
y = 4/5 x - 2 1/5
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