Book Maths Puzzle Co-ordinate geometry

what are the solutions for x2=-49; I know that it should be -7i and +7i but how do you show the coordinates

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Book Other Question

a writing workshop enrolls novelists and poets in a ratio of 5 to 3. there are 24 people at the workshop. how many novelists are there. and how many poets are there. using a syst find the answer using linear equations

A plumbing contractor decides to field-test two new pumps. One is rated at 60gal/h and the other at 150gal/h. She pumps a total of 930