1.

Find domain of the function `10^x+10^y=10`

Answer» `10^y=10-10^x`
`10^y=10(1-10^(x-1))`
`log_10 10^y=log10(1-10^(x-1))`
`y=log_10 10+log_10(1-10^(x-1))`
`y=1+log_10(1-10^(x-1))`
`log_10(1-10^(n-1))`
`1-10^(x-1)>0`
`1>10^(x-1)`
`10>10x`
`10^x<10^1`
`x<1`
Domain=`(-oo,1)`.


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