exam Maths Puzzle Numerical Ability

Solve and graph the solution set. 3x => 7x + 20 (I am figuring I need a line graph like this??

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Please help me.

What is the difference between 2x^2+4xy-3 and x^2-2xy-4? The lawn in front of Kermit Middle School is in the shape of a rectangle 30 yd long and 16 yd wide. How much shorter is your walk if you walk diagonally across the lawn rather than along two sides of it?