Question

A hardware store sells light bulbs in different quantities. the graph shows the cost of various quantities. according to the graph, what is the cost of a single lightbulb?

Answer 1

step 1

find the equation of the line

where

x-------> numbers of light bulbs

y-------> the total cost in $

let

A (0,0) B (10,18)

slope m=18/10-----> m=1.8

step 2

with m=1.8 and the point A (0,0)

y-y1=m*(x-x1)------> y=1.8x

step 3

for x=1

y=1.8*1------> y=$1.8

therefore

the answer is

the cost of a single light bulb is $1.8