Help lessen the amount of CO2

Reduce air travel. Transportation is now the number one source of greenhouse gases.Make your driving more efficient. Try substituting car trips with bike rides, bus trips, train rides, or other forms of public transportation.Plant trees. Deforestation is one of the significant causes of carbon emissions. Trees absorb and store the carbon dioxide in the atmosphere, but they can no longer absorb carbon once they are cut down. Planting trees is one of the most inexpensive, natural ways to take climate action and reduce our negative environmental impact.Switch to clean energy. Solar panels, wind turbines, and geothermal energy are all energy sources with a higher level of sustainability, produce low carbon emissions, and lower our dependence on natural gas and resource harvesting.Make your home more energy efficient.

substitute y = 2x - 4 to x + 2y = 12:

x + 2(2x - 4) = 12     use distributive property

x + (2)(2x) + () = 12

x + 4x - 8 = 12     add 8 to both sides

5x = 20     divide both sides by 5

x = 4

put the value of x to the first equation:

y = 2(4) - 4

y = 8 - 4

y = 4

answer: x = 4 and y = 4