Answer:
The correct answer is the third option: y = 4x - 20
Step-by-step explanation:
To solve this problem, we should first find two points that are located along our line of best fit. We can see that the points (25,80) and (15, 40) are both located along the line. Next, we can calculate the slope using these two points.
slope = rise/run = Δy/Δx = (80-40)/(25-15) = 40/10 = 4
Therefore, the slope of the line of best fit is 4.
To find the y intercept, we can use our equation for slope and plug in one of our points.
y = mx + b
y = 4x + b
40 = 4(15) + b
40 = 60 + b
b = -20
Therefore, the y intercept is -20.
If we put both our slope and y intercept into one equation, we get:
y = mx + b
y = 4x - 20
The correct answer is the third option.
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