Question 637010
{{{x^2 + y^2}}}= 100
If x = 6
then {{{6^2 + y^2}}}= 100
Simplify
36 + {{{y^2}}} = 100
Then subtract 36 from both sides of the equation to get:

36 + {{{y^2}}} - 36 = 100 - 36

Simplify
{{{y^2}}} = 64

find the square root of both sides:

y = +/-8

The solution is Option #4: +8 or -8