exam Maths Puzzle Numerical Ability

Find a common solution for each system of equations:

x=2y 8y=4x

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exam Other Question

HELP! I need assistance with this demand supply problem!
The demand and supply equations for a certain item are given by
D=-5p+40
S=-p^2+30p-8
Find the equilibrium price!
Thanks in advance!
ac log base 6 of 5 + log base 6 of x = log base 6 of 8

solve for x.