book Maths Puzzle Numerical Ability

How do you write an equation in function form?
Ex. -4x+6y=24

Thank you for your help.

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book Other Question

Simplify

(x^-3/4 y^1/3)(x^1/2y^1/5) The hypotenuse of a right triangle is 4 cm. longer than the one leg and 18 cm. longer than the other leg. Find the length of each side of the triangle.