exam Maths Puzzle Numerical Ability

i don't get how to do it

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Can you please help me solve this problem:

Three years ago, Rica was thrice as old as Dandy. Three years hence, she will be twice as old. Find their present ages. Describe the steps you would follow in graphing x+2y<=2. Include in your answer whether you use a solid or broken line and where you shade, above or below the line.

This is from a worksheet.