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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exam Other Question

Jeff can build 7 birdhouses in 5 hours. Write three different proportions that you could use to find out how long it would take him to build 30 birdhouses. Write a real number with ten (10) digits to the right of the decimal point that is a rational number between 0 and 2 with a 2 - digit repeating patter.