book Maths Puzzle Numerical Ability

Simply: (2 -3x)^2 I need to really understand how they came up with the answer to this one, I have my final tomorrwo. Th e other problem is find the y intercept for 2x - 3y =6. Thank you so very much for any help. Thank you Thank you.

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book Other Question

2(5a-2)+3(4-7a)=-25 graph y=3sinx and y=sin 3x on the same axes. label the graph of each function.

I know the amp. of first function is 3 and period is 2pi and for second function amp. is 1 and period is 2pi/3 i just dont know how to graph