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...Simultaneous equations introduction onoccasions you will come across two or more unknown quantities and relating them these are called when asked to solve must nd values of the unknowns which satisfy all given at same time on this leaet we illustrate one way in can be done solution a pair x y is easily veried by substituting into left hand sides obtain right so solving there many ways perhaps simplest elimina tion process involves removing eliminating leave single equation other method best illustrated example notice that if multiply both rst an equivalent now subtracted from terms involving eliminated c www mathcentre ac uk pearson education ltd part taking wish substitute value for enable us hence full idea behind suitable number either s subtraction eliminates it may also possible eliminate addition as shown next elimination carried out suppose choose made multiplying gives added exercises following pairs b d answers...