A regular light bulb costs 0.55 $ and 6$ of electricity every 1000 hours ($0.006/h).

An energy saver light bulb costs 1.55$ and uses $4 of electricity every 1000 hours ($0.004/h)

Let h hours represent the time for which the light bulbs are left burning.

Let c dollars represent the cost of the electrcity used.

C = 0.55 + 0.006h

C= 1.55 + 0.004h

a) solve the linear system – i got h= 500, and c=1.57 *is it right or wrong???

b) Explain what the solution represents, ( i said it represents the cost of electricty used is 1.57$ and the hours which the lights are left burning is 500 hours..

c) which bulb is cheaper to use? explain

that’s where i’m stuck, how can i solve this? is the rest of my solution right or wrong?