book Maths Puzzle Numerical Ability

The Difference between two numbers is 9. Find the number if the sum is 46.

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book Other Question

when a postive is multiplied by a negative is the solution a postive or a negative? i think it is postive but im not sure... write the equasion, in slope intercept form, of the line that passes through the point (-7,3) and is perpendicular to the line y=3x-5