book Maths Puzzle Numerical Ability

hi i need help how do to this problem ad= f;a

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SOLVE FOR X PLEASE
AX+BY=M
BX+AY=C
THANK YOU In 1999, cigarette consumption in the US was 125 packs per capita. This rate of consumption was 5/8 of what it was in 1980. Find the rate of consumption in 1980.