Answer :
Assuming the logarithm is base [tex]10[/tex], you have
[tex]y=10=\log_{10}x\implies 10^{10}=10^{\log_{10}x}\implies 10^{10}=x[/tex]
[tex]y=10=\log_{10}x\implies 10^{10}=10^{\log_{10}x}\implies 10^{10}=x[/tex]