book Maths Puzzle Numerical Ability

What is the slope of the line passing through the points: (1,5) and (5,2)?

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I got this wrong on a test

(-6, 4) The answer I got was y=4

The directions were to write an equation in standard form of the line satisfying the given conditions.

Thank y
How many years ago is 1 million seconds ago? The answer is approx 0.03 yrs ago, but i was unable to come up with the correct equation. Will you please show me your work?