book Maths Puzzle Numerical Ability

Solve for y in terms of x

3x+y=12

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There were a few trees in a garden. On one of them, on a pear tree, grows pears but after a strong wind blew. There were neither pears on the tree nor on yhe ground. How come? Find (a) hte discriminant, (b) the number of solutions and (c) the nature of the solutions for 5x^2-7x-4=0