Question

Penny is figuring the regression line for some data but needs help in first figuring the predicted value of y. she knows that the slope is 3 and the intercept is 4. what is the predicted y value for an x score of 7?

Answer 1

The generic equation of the line is:
y = mx + b
Where,
m: slope of the line
b: intersection with the y axis
Substituting values we have:
y = 3x + 4
For x = 7 we have:
y = 3 (7) +4
y = 21 + 4
y = 25
Answer:
The predicted and value for an x score of 7 is:
y = 25