book Maths Puzzle Numerical Ability

If f(x,y) = x+2y what is

a.f(3,5)
b.f(5,3)
c.f(a,b)
d.f(b,a)

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book Other Question

Line 1 is described by the equation 3y-2x= -3. Line 2 goes through the origin and intersects line 1 at x=6. What equation describes line 2? logx(9)=-1/3