exam Maths Puzzle Numerical Ability

Please explain how the graph of y=log base 2 of x/7 can be obtained from the graph of y=log base 2 of x. Thank you.

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exam Other Question

Right now,Im working on a area of shapes in my math,Im not sure how to draw so anyone can see this,so Im going to try another way.

Round to the nearest whole number,Use 3.14 for plot the graph of the equations 2x-3y=6 and 2x+y=-10 and interpret the result.