book Maths Puzzle Numerical Ability

Hi Tutors, it's me again I need help with the following problems can you help me. Thank you so much.

y=3x+2

x=5x

y=2x+1

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book Other Question

Simplify (be sure to rationalize all denominators)

12. x^(3/4) + 5/[x^(1/4)] (you may assume x>0)

I came to the conclution of x+5/[x^(1/4)]. This wasn't right so I thought I Premuim coffee sells for $6.00 per pound, and regular coffee sells for $4.00 per pound.How many pounds of each type of coffee should be blended to obtain 100 pounds of a blend that