exam Maths Puzzle Numerical Ability

Find the slope of the line passing through the points (-9,-1) and (-2,-1)

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exam Other Question

Write the equation of the line that passes through (2,7) and is parallel to the line 2x+3y=18 Please help this is confusing to me.
Find a value for k so tha 9m^2 - kn^2 will have the factors 3m + 7n and 3m - 7n.