book Maths Puzzle Numerical Ability

please help me step by step on how to graph the equation:

-2x+5y=-10

Thank you

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book Other Question

A rectangle has a diagonal whose length is x. The rectangle is twice as long as it is wide. What is the area of the rectangle in terms of x? yearly average of 35.18% and another of 33.43%, these are my answers but Im not sure how to figure out the number of successful repairs each candidate would make on 50 calls?

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