book Maths Puzzle Numerical Ability

Thank you in advance for your help.

Write the equation of the line in both forms:

horizontal line that goes through (3,7)

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book Other Question

Solve for the indicated variable:
2/w - y = z, solve for w

This is how I solved it, I'm I correct?
1/w = z + y/2

Thanks for your help Use the method of "completing the square" to solve the following quadratic equations:

{{{2x^2-7x-4=0}}}