Express one variable in terms of the other.
3Y - 4J = 9
3Y = 4J + 9
Y = (4J + 9)/3
------------------------
insert back into original equation
3(4J + 9)/3 = 9
you see the 3 factors cancel
4J + 9 = 9
4J = 0
J = 0
-------------you have J
3Y - 4(0) = 9
3Y = 9
Y = 3
----------------one set of solutions to this problem
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