exam Maths Puzzle Numerical Ability

How do I rewrite each equation as a function of x.

-3x + 4y = 11

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exam Other Question

Twenty men did 1/4 of a job in eight days. Then it became necessay to complete the job in the next five days. How many additional men were added to the crew of twenty to accomplish this task? decide whether lnes p1 and p2 are perpendicular:

line p1:y= 3x + 5
line p2: y= 1/3x + 5