Throughout the activity consider how well students:

• understand the concept of systems of equations;
• use appropriate vocabulary (e.g., linear, quadratic, standard form, point of intersection) in their justifications and/or explanations;
• pay close attention to appropriate details; and
• use mathematical evidence to make sound mathematical decisions or conclusions. 

• Consider using graphing technology to create the graph that shows the electricity generated by the solar panels in a year.
• Invite students to determine the energy savings from using solar panels by applying electricity rates to the amount of energy required to heat the shed.
• Use this activity as a guide to determine the feasibility of using solar energy to power other buildings like a school, home, office, or a local store.

• Students should interpret the number of months that the panels can provide sufficient energy as the difference between the points of intersection.
• Students will use the relations to determine the point of intersection between the curve and the line, then interpret the point of intersection as the time in the year at which the minimum energy requirement is achieved.
• Any quadratic model that opens down with two real roots could be used instead of the equation noted in the activity.     
• To complete this activity, students would need to be able to solve a quadratic equation using the quadratic formula.

Solar power in B.C.

Solar energy is an affordable alternative energy that can be used to help heat and power your home, school, or business. However, there are some important considerations around the use of both solar photovoltaic and solar thermal systems in British Columbia that you should be aware of. Check out bchydro.com for more information regarding the practicality of solar energy in our province.