book Maths Puzzle Numerical Ability

HOW CAN I FIND THE EQUATION OF THE LINE PASSING THROUGH THE GIVEN POINTS?
AFTER YOU FIND THE EQUATION OF THE LINE PASSING THROUGH THE GIVEN POINTS HOW DO YOU FIND THE Y-INTERCEPT?

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A right triangle has legs of lengths 7m and 9m. Which is the best estimate of the length of the hypotenuse? 10m,,11m,12m,13m solve the equation: log a (3x + 5) - log a (x - 5) = log a 8