What is the equation of the trend line in the scatter plot?

Use the two blue points to write the equation is slope-intercept form. Write any coefficients as integers, proper fractions, or improper fractions in simplest form.

The correct answer is: y = x + 1

We use the slope-intercept form or the point-slope form to find a linear function. The process of finding a linear function is the same as the process of finding the equation of a line
The given points are (x1, y1) = (0, 1) and (x₂, y₂) = (8, 8).
Step 1: Find the slope of the function using the slope formula:
m = (y₂ - y1) / (x₂ - x1) = (8 - 1) / (8 - 0) = 7/8
Step 2: Find the equation of linear function using the point slope form.
y - y1 = m (x - x1)
y - 1 = 7/8 (x - 0)
y - 1 = 7/8x
y  = 7/8x + 1

Therefore, the equation of the linear function is, y = 7/8x + 1.