OlympiadEasyAlgebra7–9

If $2^{x} = 8$ and $3^{y} = 81$ , what is $x + y$ ?

Se $2^{x} = 8$ e $3^{y} = 81$ , quanto vale $x + y$ ?

Answer options

Solution

$8 = 2^{3}$ gives $x = 3$ , and $81 = 3^{4}$ gives $y = 4$ , so $x + y = 7$ .