book Maths Puzzle Numerical Ability

I am a distance learner and I am having difficulty with an equation that my book does not give examples of. The equation reads:

X/2 + 2y =9
2x-y = 18

How do I solve this type of equation? Please help.

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book Other Question

A telescope is on sale of $250 after markdown of 20% off the regular price. Find the regular price. Sally was given 5 cents for each test she passed,
but she had to return 10 cents for every test she
failed. At the end of the trimester, Sally passed
4 times as many tests as s