exam Maths Puzzle Numerical Ability

How to do you graph the problem with a function like this y=21-2x

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exam Other Question

A two-digit number is three less than seven times the sum of its digits. If the digits are reversed, the new number is 18 less than the original number. What is the original number? If 9y^2+kyz+16z^2 is a perfect square find a value of k