Question

Between 1990 and 1999, the number of movie screens in the United States increased by about 1500 each year. In 1996, there were 29,690 movie screens. Write an equation of a line in slope-intercept form, to find the total number of screens y for any year x.​

Answer 1

`y=1,500x+20,690`

Explanation:

Write an equation of a line in slope-intercept form, to find the total number of screens y for any year x

we know that

The linear equation in slope intercept form is equal to

`y=mx+b`

where

m is the slope or unit rate of the linear equation

b is the y-intercept or initial value of the linear equation

Let

x ----> the number of years between 1990 and 1999

y ----> the number of movie screens in the United States

In this problem we have that

The unit rate or slope is equal to

`m=1,500\ (movies\ screens)/(year)`

we have the ordered pair

(6,29,690)

The x-coordinate is 6 because

1996-1990=6 years ---> is the number of years since 1990

substitute the given values in the equation

`y=mx+b\\29,690=1,500(6)+b`

Solve for b

`29,690=9,000+b\\b=29,690-9,000\\b=20,690\ movies\ screens`

The linear equation is

`y=1,500x+20,690`