Zachary purchased a computer for $1,600 on a payment plan. Two months after he purchased the computer, his balance was $1,370. Four months after he purchased the computer, his balance was $1,140. What is an equation that models the balance y after x months?

Step-by-step explanation:

1. y = x + 3 2. y = −5x + 1 3. y = __

2

3

x − 5

y 4

2

O

x

−2

−4 −2 2 4

−4

y 4

2

O

x

−2

−4 −2 2 4

−4

y

O

x

−2

2

−4 −2 2 4

−4

What slope-intercept form equation represents the line?

4. 5. 6.

y

O

x

−2

2

4

6

−4 −2 2 4

y

O

x

−2

2

−4 −2 2 4

−4

y 4

2

O

x

−2

−4 −2 2 4

−4

Write the equation in slope-intercept form of the line that passes through the

given points.

7. (−1, 3) and (−3, 1) 8. (−4, 8) and (4, 6) 9. (9, 2) and (−3, −2)

10. Zachary purchased a computer for $1,800 on a payment plan. Three months

after he purchased the computer, his balance was $1,350. Five months after

he purchased the computer, his balance was $1,050. What is an equation that

models the balance B after m months?

11. What does the slope signify in this equation and why?

y = 2x + 1

y = x + 4 y = −__

1

4x + 7 y = __

1

3

x − 1

y = −5 y = −__

1

2

x + 4

B = −150m + 1800

In the equation B = −150m + 1800, the slope signifies the

monthly payment amount because the balance decreases by

$150 each month.

$150

Step-by-step explanation:

m=-16

step-by-step explanation: