Book Maths Puzzle Co-ordinate geometry

Why is there two x-intercepts and one y-intercept in a quadratic equation solution?

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Book Other Question

I cannot understand how to do this problem:

Find two consecutive integers such that the sum of 2 times the first integer and 4 times the second integer is 46.

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Ali,Amad and Amin share RM240. Ali's share is four times as much as Amin's and Amad's share is one-third of Amin's.How much is each of their shares?