exam Maths Puzzle Numerical Ability

question one:
give three solutions for (((-2x+5y=1)))
i don't understand how and what they want me to do for this question.

question two:
how do i solve this equation (((1+

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exam Other Question

Perform the indicated operations

(2x^6 - 8x^3)(8x^6 + 3x^3 - 8) Frank can complete a job in 5 hours. Joe can do it in 8 hours. After Frank had worked for two hours, Joe was asked to help Frank complete the job. In how many hours after Joe has started will they complete the job?