Be careful to note what a GCSE question is asking. If it states ‘solve algebraically’ then you must do so. To find solutions from graphs, look for the point where the two graphs cross one another.
Journal of Applied Econometrics, Vol. 10, No. 2 (Apr. - Jun., 1995), pp. 187-200 (14 pages) We propose a general strategy to estimate semi-parametrically simultaneous equations with limited dependent ...