exam Maths Puzzle Numerical Ability

Equations expressed it in standard form. Please help me with the steps, I need some understanding in how it is done. Thanks, and thanks for this website.

Through (8,3) and (-4,3)

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exam Other Question

this year,75%of a graduating class had taken at least 8 mth courses. Of the remaining class members,60% had taken 6 or 7 math courses.what percent of the graduating class had taken fewer than 6 math courses? If the sqaure of a positive integer is added to three times the integer, the result is 28. Find the integer.

Need help setting up the problem and possible solving. Once it is set up, I am good with solving it. PLEASE help~