exam Maths Puzzle Numerical Ability

evaluate if x=-1 and y=3

y-7x over 6x+xy

simplify x^-6 over y^-5
thanks

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exam Other Question

if tanX=(asinY)/(1-acosY) and tanY=(bsinX)/(1-acosX) then show that (sinX/sinY)=(X/Y) I need help with this one please. I have to graph and identify the y intercept
y = 3/2x + 2 Thanks so much for any help.