book Maths Puzzle Numerical Ability

(1)5x-y=5
(2) x+3y=6
(3) graph y=3x
(4) graph (-7, -4) and (-1, -10).

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book Other Question

Jenny has bought a new condo. The closing has been set for 45 days from today. The builder estimates that the remaining work on the condo will take about 750 hours to complete. Wr Populations of two villages X and Y are in the ratio of 5 : 7 respectively. If the population of
village Y increases by 25000 and the population of village X remains unchanged the respective ratio
of their populations becomes 25 :36. What is the population of village X ?
6,25,000
6,75,000
8,75,000
i need explanation