Question

. The electricity cost y, in dollars, to use a

hair dryer for x minutes can be represented
by the equation y = 0.002x. The electricity
cost to use a space heater is shown on the
graph. Which appliance is more expensive
to use? Explain. (Example 4)
Space Heater
0.09
0.08
0.07
0.06
0.05
0.04
0.03
0.02
0.01
0
Electricity Cost ($)
y
123456789
Time (min)
X

Answer 1

D)The space heater, because it has the greater unit rate for electricity cost.

Explanation:

I DID IT AND GOT IT RIGHT!

Answer 2

The hair dryer is less expensive to use compared to the space heater.

The electricity cost of using a hair dryer for x minutes can be represented by the equation y = 0.002x. The electricity cost to use a space heater is shown on the graph.

To determine which appliance is more expensive to use, we need to compare the electricity costs for the same amount of time.

We can do this by substituting the same value for x in the equation and comparing it to the cost on the graph.

Let's say we want to compare the electricity cost for using both appliances for 5 minutes.

For the hair dryer, we substitute x = 5 into the equation:

y = 0.002(5) = 0.01 dollars

From the graph, we can see that the electricity cost for the space heater after 5 minutes is approximately 0.045 dollars.

Therefore, the hair dryer is less expensive to use compared to the space heater.