exam Maths Puzzle Numerical Ability

How do you solve 4x-y=19? Do you replace in the x and then a y with any #?

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3L=?mL Thanks for your help!!
Jill has $3.50 in nickles and dimes.If she has 50 coins, how many of each type of coin does she have? McGraw Hill 6th edition,8.2, # 56.