book Maths Puzzle Numerical Ability

Find an equation of the line (in general form or slope-intercept form) that contains the point (0,4) and is perpendicular to the line x - 2y = -5.

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book Other Question

what is the evaluation of y2, when y = 9 How do you figure a percentage profit on cost?
If you have a item with the cost of $150.00 and want to make 35% profit on it what formula do you use? Is that called gross profit on cost?
Thanks,
Ron.