Question

Jenelle has 5 gallons of paint after painting 800 ft.² of walls in her house. she has 3 gallons left. the graph below shows Jenelle’s situation.

Answer 1

given the points

(0,5), 0 ft^2of wall painted, 5 gallons of paint left

(800,3), 800 ft^2 of wall painted, 3 gallons of paint left

slope is given by

`m=(y2-y1)/(x2-x1)`

then

`m=(3-5)/(800-0)`
`m=(-2)/(800)`
`m=-(1)/(400)`

the line equation is

`y=mx+b`

where b is the y-intercept = 5

then

`y=-(1)/(400)x+5`

then

the correct answer is option A