Question 9810
hi anna,

when you have 2 unknowns, here your a and c, you need 2 equations to solve them.


The whole point is to combine the 2 equations to get rid of one of the 2 unknowns...you added the 2 equations and still had 2 unknowns... pointless!


Try subtracting one equation from the other. This will remove the a term, leaving just the c, which you can then find


Jon.