exam Maths Puzzle Numerical Ability

if x+2y=10andx+5y=19what is the value of y

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exam Other Question

Use the fomula 1/f=1/a+1/i to find the image distance i for an object that is 2,000,000 mm from a 250mm telephoto lens. What is the domain and range of the following relation: r = (x + 2)/(x - 1)?