book Maths Puzzle Numerical Ability

IS EACH EQUATION A DIRECT VARIATION? IF IT IS, WHAT IS THE CONSTANT OF VARIATION?
A. Y= 5/8X
B. 3Y=8X
C. X+5Y=10

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how can i find the argument of (1+i)^13/(1-i)^7 Walnuts sell for $2.00 per pound and Pecans for $2.25 per pound. You plan to mix 160 pounds of walnuts. How many pounds of Pecans should be mixed to produce a mixture that sells