Question

Marquis wrote the linear regression equation y=1.245x - 3.684 to predict the cost, y, of x songs purchased. Marquis spent $40 on songs. Which is the best estimate of the number of songs that Marquis purchased?

Answer 1

Answer: C. 35

Explanation:

y = 1.245x - 3.684

Clearing x:

1.245x = (y + 3.684)

x = (y + 3,684) / (1,245)

Substituting the value of y:

x = ((40) +3,684) / (1,245) = 35.09

x = 35

Answer 2

What you should do for this casp is to use the given expression and clear the value of x.
We have then:
y = 1.245x - 3.684
Clearing x:
1.245x = (y + 3.684)
x = (y + 3,684) / (1,245)
Substituting the value of y:
x = ((40) +3,684) / (1,245) = 35.09
x = 35
answer:
the best estimate of the number of songs that Marquis purchased is 35