exam Maths Puzzle Numerical Ability

solve equation by completing the square

3x^2-8x=2

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exam Other Question

Ron Wood can paint a room in 6 hr working alone. If his son, Jason, helps him, the job takes 4 hr. How long would it take Jason to do the job if he worked alone? Find the slope of the line that passes through these points (0,-4)

I do not seem to understand how this is done can you help?