exam Maths Puzzle Numerical Ability

I need to know what are the steps to find out this question:

x= 2y-1
3x-3y=9


My textbook is the Glencoe Alegebra 1 for Florida.

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exam Other Question
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f(x)* h(x)

if
f(x)= 7x-40
h(x)=-x^2 + 6x I need help solving -3/5[2/3-1/2(3/4-1/2)]