The graphing method involves graphing the two equations. The intersection of the two lines will be an x,y coordinate, which is the solution.

With the substitution method, rearrange the equations to express the value of variables, x or y, in terms of another variable. Then substitute that expression for the value of that variable in the other equation.

For example, to solve:

1. Is it possible to duplicate the process of preparing oil gas using Kerosene oil? 2.analyse the use of the Benzol n oil utilized in the production of coal gas? 3. Which component is obtained as a by-product during the production of coke-oven gas? Describe it in 4.critique; Coke-stove gas has a higher calorific worth than the coal gas. 5. In oil gasification, how much water is mixed with naphtha? Explain. 6. Set the optimal interval temperature for the substitute natural gas preparation. 7. Link the syngas to the natural gas produced. 8. Locate or position the India maximum natural gas geography accordingly. 9. Describe the sequence of events that can lead to the discovery of sulfur in the natural gas recovered. 10. Remove or eliminate the undesirable component in the natural gas in order to provide an explanation.