exam Maths Puzzle Numerical Ability

one number is equal to two times a second number. two time the first number plus two times the second number is 24. if you let x stand for the first number and y for the second, what are the two number.

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Have I rounded this correctly. I am supposed to round to the nearest tenth. The number is 75.982 I have 76.0. is this correct? This gets confusing for me and I thank you for your time and help. How do I grapgh the function that has the following properties: concave up, y-intercept is -6, zeros at x = -2 and x = 3?